Word Problem

You have $50 and you go to the sporting good store and buy a ball for $15.

The ball doesn't hold air so you return it to get another $15 ball.

The second ball doesn't hold air either so you return it, but get a $25 ball.

This ball works but you sell it to a friend for $20.

You immediately go back to the store to buy another $25 ball but a $45 ball catches your eye.

Ball = life