This is when the result of a given percentage increase or decrease is provided and the original amount is required to be calculated.
Jane brought trousers from a sale. She received 15% off and only paid $25. What is the original price?
This is calculated using inverse operations.
p will be the original price of the jeans.
p × 0.85 = $25 so p = $25 ÷ 0.85 = $21,25
Points to note:
in order to get back to the original amount, inverse operations is used to divide the new amount by 0.85 and to get back to the original amount.