4. Moses is a Sales Representative receiving an annual salary of 130,000 plus commission on all his sales above quota of 25,000 in accordance with the following schedule:

First 30,000 above quota - %

Next 50,000 - 1%

Next 70,000 - 2%

Over 150,000 - 3%

Compute for his gross earnings if his sales for the month:

a. 24,800

b. 57,600

c. 67,700

d. 120,300

I think you need to divide the annual salary to 12 months for monthly or the basic salary