You have a stamp collection and make a 35% profit by selling it on E-Bay for $2700. Find the original cost of the collection by using the formula:New value × 100 / 100 + percent change = Original value

Hi Ana. I think I see your problem. There should be parentheses, or
brackets, in the formula:

( New value x 100 ) / (100 + percent change) = original value.

Try to work it out now.
Stephen La Rocque.

Math Central is supported by the University of Regina and The Pacific Institute for the Mathematical Sciences.