A salesman is paid a salary of 15375 per month he also gets a commission of 4.5 on the amount of money he makes for the sale in a certain month he earned 28875 calculate the value of his sales that month
Assuming you meant 4.5% commission...
28875 = 15375 + .045(x), where x is his sales
.045x = 13500
x = 13500/.045 = 300000