-A reverse percentage question is one where we are given the value after a percentage increase or decrease and asked to find the value before the change
What can you be asked to find for a reverse percentage?
-To spot a reverse percentage question, see if you are being asked to find a quantity in the past
Find the old / original / before amount ...
How do you calculate original mass?
-Use "before" × p = "after" to write an equation
-The "before" amount is unknown and the "after" amount is (X)
Find the multiplier, p
Find the value of "before" (by dividing both sides by the multiplier
