Question

The price of bread went from $1.50 per loaf to $2.50 per loaf in four years. Find the rate of change of the price of bread.

Answer 1

The increase in price in 4 years can be written as ($2.50-$1.50)/4 = 0.25 cents every year, which makes sense because 4 x 0.25 = $1, which is the change in price over those 4 years.  Got it?