SOLUTION: A school orders a number of copies of a prescribed book at a total cost of R7.The school is later notified by the bookseller that the price of the book had been raised by 10c per c

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Question 966044: A school orders a number of copies of a prescribed book at a total cost of R7.The school is later notified by the bookseller that the price of the book had been raised by 10c per copy ,and that consequently 8 copies fewer would be sent . find the number of copies originally ordered ,and also the original price.
Answer by josgarithmetic(39617) About Me  (Show Source):
You can put this solution on YOUR website!
n books at price 7%2Fn R per BOOK.

Price Increase! 7%2Fn%2B0.1 R per BOOK is the new price. Number of books to receive is now n-8.

The cost stayed the same before price increase and after the price increase.
PRICE%2ACOUNT=COST;

7=theCost
highlight_green%287=%287%2Fn%2B0.1%29%28n-8%29%29

7n=%287%2B0.1n%29%28n-8%29
7n=7n%2B0.1n-56-0.8
0=0.1n-56.8
0.1n=56.8
highlight%28n=568%29