5.9 Robert works for Southern Consulting as a sales executive. He is paid a monthly salary of R3,350 plus a straight commission of 4.3% on all sales over R10,100. If he sells R15,300, what is his total gross pay for the month? a. R3,573.60 b. R3,784.30 c. R4,007.90 d. R8,550.00