Percentages. oh boy!

Question

A store is offering a 10% discount on all items. Write an equation relating the sale price S for an item to its list price L.

Answer 1

Well Luis...

 

If you have an item that is sold at list price, the item would be L.  If you took off 10% of the list price it would be the List price - 10% of the LIst price and that would equal the Sale price.  So an equation could look like this...

 

L - .10L = S... I suppose we could combine our like terms on the left side of the equation, so the left side would be, let'see, what is L - .10L???