Ramon Perez worked 40 hours at $13.00 an hour and five hours of overtime at time-and-a-half. What was his pay for the week?

His regular pay: 13*40 = 520

His overtime pay: (13*1.5) * 5 = 19.5*5 = 97.5

His pay for the week: 520+97.5 = 617.5

In his regular pay, you just multiply the hours he worked by the pay he got per hour. In his overtime pay, you just multiply the pay per hour by time-and-a-half (1.5) and then by 5 hours he worked overtime. In the end, you just add all these numbers to get $617.5