The formula to figure out the percentage increase or decrease is:
(new - old) / old * 100%
new = 60
old = 72
(60 - 72) / 72 * 100%
-12 / 72 * 100%
= -1/6 * 100%
= -0.1666... * 100%
≈ -16.667%
Because it is negative, that's a decrease.
Answer:
A decrease of about 16.7%