Amanufacturer of laptop computers has a 75 percent customer retention rate. their accounting department estimates the incremental contribution to profit and overhead as 35 percent. on average, customers purchase the laptop every two and a half years at an average cost of $750. determine the average value of a loyal customer.

(a) $140
(b) $396
(c) $420
(d) $1012
(e) $2625