Answer: a. 10%
b. -30%
Step-by-step explanation:
a. What is the percentage change in the price of milk?
Old price = $5.00
New price = $5.50
Percentage change = ($5.50 - $5.00)/$5.00 × 100
= 0.50/5.00 × 100
= 1/10 × 100
= 10%
Percentage change on price = 10%
b. What is the percentage change in the quantity demanded for Boo Berry Cereal?
Old quantity = 1000
New quantity = 700
Percentage change = (700 - 1000)/1000 × 100
= -300/1000 × 100
= -30%
The percentage change in the quantity demanded for Boo Berry Cereal is -30%.