I did not get an answer since I submitted 2 hours ago .... Could someone else review please...

Artemis is paid a weekly commission of4% on net sales of$6000, 8% on the next$3000, and12.5% on all further sales. Her gross sales for a week were$11,160 and sales returns and allowances were$120.

(a)

What were her gross earnings for theweek?

(b)

What was her average hourly rate of pay for the week if she worked 43hours?

I am getting the hourly rate pay by subtracting the worth sold from the totals and each commission and averaging of the three commission pay to get the hourly pay rate, however my answers are wrong .

A) 870 per week ?

B) 240 + 240 + 270 + 120 = 870 / 43 hours = $20.23 per hour ?