A shopping club is having a a sale. Members and non-members of the club receive different discounts, as shown below for members: 25% off of the selling price with a further $20 off with a minimum purchase of $500 for non members: a)10% off the selling price and a further $20 off with a minimum purchase of $500 Sally is not a member of the shopping club. She wants to purchase a camcorder that is selling at $580. How much does sally have to pay for the camcorder? b)tabitha is a member of the shopping club. She wants to purchase a laptop that is selling at $990. How much does tabitha have to pay for her laptop?