Answer:
Option (a) is correct.
Explanation:
Given that,
In 1975:
Nominal price = $0.10
CPI = 52.3
In 2005:
Nominal price = $1.00
CPI = 191.3
1975 is the base year
Real price in 2005;
= Nominal price in 2005 × (CPI in 1975 ÷ CPI in 2005)
= $1.00 × (52.3 ÷ 191.3)
= $0.273
Therefore, the real price of tennis ball in 2005 is $0.27 in terms of 1975.
The real price of tennis ball in 1975 is $0.10 because the base year is 1975 itself.
When we are comparing the real prices of the years 2005 and 1975, we conclude that tennis ball is cheaper in 1975 as compared to 2005.