Assume all sales are one-time credit sales with a probability of collection of 96 percent. The variable cost per unit is $1.67, the sales price per unit is $4.99, and the monthly interest rate is 1+0.1*5 percent. What is the NPV of a credit sale of one extra unit? A) $2.849 B) $2.807 C) $2.766 D) $2.725 E) $2.685