SOLUTION: Carol earned $15,000 +5% commission on sales over $10,000 how much must she making sales to earn more than $20,000?

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Question 955482: Carol earned $15,000 +5% commission on sales over $10,000 how much must she making sales to earn more than $20,000?
Answer by josmiceli(19441) About Me  (Show Source):
You can put this solution on YOUR website!
Let +x = amount of sales that
is over $10,000
Carol's commission is:
+.05%2A%28+10000+%2B+x+%29+
---------------------
For her to make $20,000:
+20000+=+15000+%2B+.05%2A%28+10000+%2B+x+%29+
+5000+=+.05%2A%28+10000+%2B+x+%29+
+5000+=+500+%2B+.05x+
+.05x+=+4500+
+x+=+450000+%2F+5+
+x+=+90000+
and
+10000+%2B+90000+=+100000+
She needs to make $100,000 in sales