Jack watkins earns a base salary of $1500 a month, plus a 4% commission on the sales he makes. what is his gross pay of his sales for the month are $8000. a. 1520 b. 1532 c. 1700 d. 1820

Jack Watkins earns a base salary of $1500 a month, plus a 4% commission on the sales he makes. What is his gross pay of his sales for the month are $8000. 
solution:
Gross pay=(salary)+(commissions)
base salary=$1500
commission=4%
monthly sales=$8000
commissions earned in cash
=4/100×8000
=$320

thus
Gross salary=320+1500=$1820

The answer is 16.66 i'm pretty sure