Answer:
a. 116.9 and the inflation rate was 16.9%
Step-by-step explanation:
Definition
Consumer Price Index (CPI) is a statistical measure that is constructed using a weighted average market basket of consumer goods and services produced by a household.
CPI = (Cost of market basket ₓ / Cost of market basket ₓ₁) * 100
where x = present year(2014) and x1 = base year(2012)
CPI = (90/77) * 100
CPI = 116.88
CPI = 116.9 (to 1 decimal place)
Inflation =Current year basket cost - Base year basket cost * 100
Base year basket cost
Inflation = 90-77 * 100
77
Inflation = 16.88
Inflation = 16.9% ( to 1 decimal place)