Question

Find the percentage change in the cost of an article which is first increased by 20% and then decreased by 40%. Pls give step by step explanation.

Answer 1

Answer:

-28%

Step-by-step explanation:

Let initial cost = 100

at 20% increase : cost = 100 + 100 * 20 / 100 = 120

then decreasing by 40% : cost = 120 - 120 * 40 / 100 = 72

Therefore change in cost = 72-100 = -28

So % change in cost = -28 / 100 * 100 = -28%