SOLUTION: last year backpack sales were 10% more than they were the year before. this yer's sales are 1452 units, which is 10% more than last year. find the number of backpacks sold two year

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Question 492894: last year backpack sales were 10% more than they were the year before. this yer's sales are 1452 units, which is 10% more than last year. find the number of backpacks sold two years ago.
Answer by josmiceli(19441) About Me  (Show Source):
You can put this solution on YOUR website!
Let +x+ = backpack sales 2 yrs ago
given:
Last year's sales were +x+%2B+.1x+=+1.1x+
This year's sales = +1.1x+%2B+.1%2A%281.1x%29+=+1.1x%2A%281+%2B+.1%29+
+1.1x%2A%281+%2B+.1x%29+=+1.1%5E2%2Ax+
+1.1%5E2%2Ax+=+1.21x+
Also given:
+1.21x+=+1452+
+x+=+1200+
1200 backpacks were sold 2 years ago