Math help...calculating sales and commission rates?

Godfrey

New member
Hey everyone
I'm just currently stuck on this problem

Michael's gross monthly salary is based on commission rates of 2% for the first $20,000 of sales, 3% for the next $30,000 and 4% on all additional sales for the month.
What was his sales total for the month in which he was paid $6560?

I know that at 2% he has $400 and at 3% $900 and I think at 4% that's $1200
But I don't know how to figure out how much his sales total for the month when he's paid
$6560

Can someone please show me how to solve this?

Thanks

Jeff
 
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