Malik purchased a pair of roller blades that were originally priced at $250 for a sale price of $180. He charged the roller blades on his credit card and made the minimum monthly payment of $20. When he received his first statement, he read that the minimum finance charge for each month that there was a balance on the card would be $15. If Malik waited until he had the $250 cash in hand to pay for the roller blades, how much money would he save?