SOLUTION: a car dealer earns a 4% commission on all cars sold. last month, he earned $7,200 in commission. he wants to earn $8,000 in commission this month. what increase in total sales from

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Question 732083: a car dealer earns a 4% commission on all cars sold. last month, he earned $7,200 in commission. he wants to earn $8,000 in commission this month. what increase in total sales from last month's total sales does he need in order to reach his goal for this month?
Answer by josmiceli(19441) About Me  (Show Source):
You can put this solution on YOUR website!
Let +x+ = last month's sales
+.04x+=+7200+
+x+=+7200%2F.04+
+x+=+180000+
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He wants to earn $8,000 in commission this month.
Let +y+ = increase in sales over last month's sales
+.04%2A%28+180000+%2B+y+%29++=+8000+
+7200+%2B+.04y+=+8000+
+.04y+=+800+
+y+=+800+%2F+.04+
+y+=+20000+
He must increase his sales by $20,000 over last month's sales