A bookstore recorded a decrease in the sales of paperback books over the past year. From last year to this year the store experienced a 12% decrease in sales This year the store sold 7040 books. How many did it sell last year?

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Answer 1 · 2016-11-02T19:29:40

Last years sales count was 8000

Note that % is like a unit of measurement and it is worth #1/100#

Let last years book sale count be #b#

Then #" "b-12%b=7040#

Factor out the #b#

#b(1-12%)=7040#

#b(1-12/100)=7040#

#bxx88/100=7040#

#b=100/88xx7040 = 8000#