The price of apples went from $0.30 per lb to $0.90 per lb in three years. Find the rate of change of the price of apples.
A) $0.10 per pound per year
B) $0.20 per pound per year
C) $0.30 per pound per year
D) $0.40 per pound per year
You have to do change of y over change of x, substitute the numbers to get 0.30-0.90 for y then 1-3 for x, get -0.06/-2 and solve that to get 0.3 per pound per year, which is answer C
