Sunday

April 20, 2014

April 20, 2014

Posted by **Anonymous** on Saturday, March 28, 2009 at 5:30pm.

- math -
**Reiny**, Saturday, March 28, 2009 at 6:05pmlooks like

Cost = 900 + 42n , where n is the number of books

for 600 books cost = 900+42(600)

= 26100

cost per book = 26100/600 = 43.50

for 200 books cost = 900 + 200(42)

= 9300

cost per book = 9300/200 = 46.50

so how much do they save per book?

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