# math

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A high school has designed he yearbook. A company charges \$900 to assemble the master copy and \$42 to make additional copies. The total selling price depends on how many copies are made. Write a funtion rule and determine how much will the school save on each book by ordering 600 instead of 200?

• math -

looks 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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