A collection of books went on sale, 4/5 of which were sold at $6.40 each. If none of the remaining 25 books were sold, what was the total received for the books that were sold?
Let total number of books = x
4/5 of x sold at $6.40 each. => revenue = 4x/5 * 6.4
remaining books = 1/5 of x = 25 => 1/5 * x = 25 => x= 125
So total revenue = (4* 125 /5) * 6.4 = $ 640
Answer: E
Let total number of books = x
4/5 of x sold at $6.40 each. => revenue = 4x/5 * 6.4
remaining books = 1/5 of x = 25 => 1/5 * x = 25 => x= 125
So total revenue = (4* 125 /5) * 6.4 = $ 640
Answer: E
