a. E7-1B. Internal Control Explain how each of the following procedures strengthens a company's internal control: Susan Corporation's photocopy machines are activated by keying a code number. Each employee is assigned a different, confidential code number. Each copy machine keeps track of the number of copies run under each employee number. b. Pike Company's bank requires a signature card on file for each Pike Company employee who is authorized to sign checks. c. Speedy Stop Convenience Stores have programmed their cash registers to imprint a blue star on every 300th receipt printed. A sign by each cash register states that the customer will receive $2 if his or her receipt has a blue star on it. d. Wurst Corporation has a policy that every employee must take two weeks of vacation each year