The price of apples went from $1.99 per lb to $3.19 per lb in four years. find the rate of change of the price of apples.
a) $0.30 per lb per year
eliminate
b) $0.50 per lb per year
c) $0.80 per lb per year
d) $1.10 per lb per year

The answer is A. add $0.30 to $1.99 four times and it comes out to $3.19. by adding .50, the total after four years comes to $3.99. add .80 four times, $5.19. add $1.10 four times and it comes to $6.39. you can also multiply the answer choices by 4 and then add $1.99 to get the same thing.