thomas martin receives an hourly wage rate of $15, with time and a half for all hours worked in excess of 40 hours during a week. payroll data for the current week are as follows: hours worked, 48; federal income tax withheld, $339; social security tax rate, 6.0%; and medicare tax rate, 1.5%. what is the gross pay for martin? a.$720 b.$1,080 c.$1,440 d.$780