Question

Referring to the equation for earnings on a checking account (I = rB – sx – f, where), if r = 0.005, s = .05, x = 72, and f = $3.00. Then bank requires a minimum balance of $800 to earn interest and charges the service fee (f) regardless of the customer's balance. What are the customer's earnings for the month if only the minimum balance (B) of $800 is maintained?
A. -$2.60
B. 0
C. $2.65
D. $3.00