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