18. A shop is willing to purchase used entertainment products for resale. The shop will purchase CDs for £1 each, DVDs for £2.50 each and video games for £7.50 each. Similarly, every £0.50 worth of products sold to the shop accrues 1 loyalty point. If a customer sells 26 CDs, 10 DVDs and 5 video games, how many loyalty points has the customer accrued from this transaction?