Flashbinder Guitars, Inc. is considering a lockbox system that will increase its check processing cost by $.15 per check. The company estimates an average check size of $1,700 and expects the lockbox to reduce check collection time by 3 days. What annual before-tax yield must Flashbinder Guitars, Inc. earn on its marketable securities for the lockbox system to be beneficial?

a. 1.825%

b. 1.118%

c. 1.074%

d. 0.735%