Question

Find the percentage change in price in each of the following examples using the mid-point method.
Instructions: Round your answers to two decimal places. If you are entering a negative number be sure to include a negative sign (-) in front of that number.
a. The price of a $4 sandwich increases to $5: percent
b. A sale discounts the price of a sofa from $750 to $500: percent

Answer 1

Answer:

0.22

-0.40

Explanation:

midpoint change in price = change in price / average of both price

a. change in price =  (5 - 4) = 1

average of both prices = 0.5 (4 + 5) = 4.50

midpoint change in price = 1/ 4.5 = 0.22

b.  change in price = (500 - 750) = -250

average of both prices = 0.5(750 + 500) = 625

-250 / 625 = -0.4