The Discover credit card is advertising a special 5% cash-back bonus on all grocery store and restaurant purchases. Discover Card users also receive the regular 1% cash-back bonus on all other purchases. I Imagine that you typically charge a total of $1,600 a month. Of those $1,600 charged, 1/4 is for purchases in grocery stores and restaurants. Use this information to calculate the total amount of your monthly cash-back bonus. Select your answer from the following choices. Support your work with calculations. (a) $32 (b) $40 (c) $112 (d) $200 (e) $400