You helped 3.6 customers per half hour. how many did you help in 7.5 hours?

Customer Helped per half hour = 3.6
=> customer Helped per hour = 3.6 * 2
=> customer Helped per hour = 7.2
=> customer Helped in 7.5 hour = 7.5 * 7.2
=> customer Helped in 7.5 hour = 54
54 will come in blank.
I helped 3.6 customer per half hour yesterday. so i helped 54 customers in 7.5 hour yesterday

The answer is 54 customers