I want to get the total amount with the help of Final amount and Discount rate.
For Example.
Grand total = 100
Discount = 15%
Final Amount =100*.15=85
if I have only two variables
Final amount = 85
Discount = 15%
Grand total = ?
Now I can get back Grand total with the help of "Final Amount" and "Discount rate"?
Let Grand Total = X
X-(X * 15 %) = 85 then if you find the value of X then your Grand total can e found.
X - 3X/20 = 85
17X= 85*20
X = (85/17)*20
X =100
Put it .. You will find the Grand Total