helen has 80 books
each book is fiction or non fiction
the ratio of the number of fiction books to the number of non fiction books is 3:1
each book has normal price of £10
helen reduces the price of all non fiction books
non fiction all books 1/2 price
helen sells all 80 books
work out total amount of money helen will receive
Mathbot Says...
I wasn't able to parse your question, but the HE.NET team is hard at work making me smarter.