If the marginal utility from consuming the fifth unit of a product is 6 and the total utility from all five units is 162, then the total utility from consuming four units must be

A) 168.
B) 27.
C) 156.
D) 972.

To decrease the amount required today to fund a $10,000 debt due two years from now, you could _____ on your savings.

A) Increase the rate of interest earned
B) Decrease the number of compounding periods per year
C) Earn simple interest rather than compound interest
D) Both decrease the rate of interest and the number of compounding periods per year
E) Either decrease the rate of interest or decrease the number of compounding periods per year