Let x be 2. 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+x percent. What is the NPV of a credit sale of one extra unit?

A) $3.073

B) $3.026

C) $2.981

D) $2.936

E) $2.892