Thomas Martin receives an hourly wage rate of $18, 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, 42; federal income tax withheld, $315; social security tax rate, 6.0%; and Medicare tax rate, 1.5%. What is the gross pay for Martin? Oa. $1,512 Ob. $774 Oc. $756 Od. $1,134