Q: A shopkeeper marks the price of his goods at 25% higher than the original price. After that, he allows a discount of 12%. What profit or loss does he get?
To write this as an equation,
we can define a variable "z" as the net percent change in value.
Then we can set up the equation as follows:
z = (x + y + xy/100)%
= (25 - 12 + (-12 * 25)/100)%
= 10%
So the equation is:
z = 10%