Answer:
increase in cost of living of 9.09%
Explanation:
The cost of living for 2016 is goven as
(10 pizzas*$10) + (7 jeans * $40)+ (20 gallons of milk * $3)
= 100 + 280 + 60= $440
The cost of living from 2017 is
(10 pizzas*$14) + (7 jeans * $40)+ (20 gallons of milk * $3)
= 140 + 280 + 60
= $480
The percentage increase in cost of living between 2016 and 2017= (Cost of living in 2017/cost of living in 2016)* 100
= {480/440}* 100
= 109.09%
So there was a increase in cost of living of 9.09%