Calculate percentage saved between two numbers

Question

I have two numbers  the first  is the original price  the second  is the discounted price   I need to work out what percentage a user saves if they purchase at the second price    example 25  10   60    365  165   55    What I dont know is the formula to calculate this

User · Answer

I see that this is a very old question  but this is how I calculate the percentage difference between 2 numbers    1 -  oldNumber   newNumber     100   So  the percentage difference from 30 to 40 is    1 -  30 40     100    25   meaning  increase by 25     The percentage difference from 40 to 30 is    1 -  40 30     100   -33 33   meaning  decrease by 33     In php  I use a function like this   function calculatePercentage  oldFigure   newFigure            if    oldFigure    0   amp  amp    newFigure    0                  percentChange    1 -  oldFigure    newFigure    100                    else                percentChange   null                    return  percentChange

User · Answer

function calculatePercentage  oldFigure   newFigure         percentChange      oldFigure -  newFigure     oldFigure    100      return round abs  percentChange

User · Answer

I have done the same percentage calculator for one of my app where we need to show the percentage saved if you choose a  Yearly Plan  over the  Monthly Plan   It helps you to save a specific amount of money in the given period  I have used it for the subscriptions      Monthly paid for a year - 2028    Yearly paid one time - 1699      1699 is a 16 22  decrease of 2028       Formula  Percentage of decrease    2028 - 1699  2028   329 2028   0 1622     16 22    I hope that helps someone looking for the same kind of implementation   func calculatePercentage monthly  Double  yearly  Double  - gt  Double       let totalMonthlyInYear   monthly   12     let result     totalMonthlyInYear-yearly  totalMonthlyInYear  100     print  percentage is -  result      return result rounded toPlaces  0      Usage    let savingsPercentage   self calculatePercentage monthly  Double  monthlyProduct price   yearly  Double annualProduct price    self btnPlanDiscount setTitle  Save   Int savingsPercentage     for   normal    The extension usage for rounding up the percentage over the Double   extension Double       Rounds the double to decimal places value func rounded toPlaces places Int  - gt  Double       let divisor   pow 10 0  Double places       return  self   divisor  rounded     divisor          I have attached the image for understanding the same   Thanks

User · Answer

The formula would be  original - discounted  original  i e   365-165  365   0 5479

User · Answer

If total no is  200 and getting 50 number then take percentage of 50 in 200 is   50 200  100   25

User · Answer

100  - discounted price   full price

User · Answer

I know this is fairly old but I figured this was as good as any to put this  I found a post from yahoo with a good explanation   Let s say you have two numbers  40 and 30       30 40 100   75    So 30 is 75  of 40       40 30 100   133     So 40 is 133  of 30    The percentage increase from 30 to 40 is       40-30  30   100   33     The percentage decrease from 40 to 30 is     40-30  40   100   25     These calculations hold true whatever your two numbers    Original Post

User · Answer

list price - actual price     list price     100    For example     25 - 10    25    100    60

User · Answer

This is function with inverted option   It will return     change  - string that you can use for css class in your template  result  - plain result   formatted  - formatted result     function getPercentageChange   oldNumber    newNumber    format   true    invert   false          value         newNumber -  oldNumber        change                sign                   result       0 00       if    invert              if    value  gt  0                 going UP              change                up                sign                                  if    oldNumber  gt  0                      result             newNumber    oldNumber    100                else                    result       100 00                          elseif    value  lt  0                         going DOWN              change                down                  value                  abs  value                result                 oldNumber    newNumber    100               result               abs  result                sign                  -             else               no changes                 else           if    newNumber  gt   oldNumber                      increase              change                up                if    oldNumber  gt  0                       result        newNumber    oldNumber   - 1    100                else                   result   100 00                              sign                                elseif    oldNumber  gt   newNumber                      decrease              change                down                if    oldNumber  gt  0                       result        newNumber    oldNumber   - 1    100                 else                    result   100 00                              sign                  -             else                   no change                      result   abs  result                result formatted         number format  result  2        if    invert             if    change     up                   change    down            elseif    change     down                   change    up            else                                    if    sign                         sign    -            elseif    sign     -                   sign                 else                                     if    format              formatted              lt span class  going    change    gt    sign     result formatted     lt  span gt          else           formatted             result formatted             return array   change    gt   change    result    gt   result    formatted    gt   formatted

[math] Calculate percentage saved between two numbers?

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