Which one of the following is a way to get out of a repeated Prisoner's Dilemma Nash Equilibrium?

In 1970 the CPI was 39, and in 2000 it was 172. A local phone call cost $0.10 in 1970. What is the price of this phone call in 2000 dollars?

A) $1.42 B) $0.39 C) $1.72 D) $0.44 E) $0.23

Labor cost on an average accounts for about _____ percent of the total cost of production

a. 10 b. 30 c. 50 d. 70 e. 98