Hi i need help on the following question: In a teashop 70% of customers order tea with milk, 20% tea with lemon and 10% with neither. of those taking tea with milk 3/5 take sugar, of those taking tea with lemon 1/4 take sugar, and of those taking tea with neither milk or lemon 11/20 take sugar. a customer is then chosem at random. i need to find the probability that the customers take suggar or milk or both. i know that the answer is o.525 but i dont know how. can anybody help me please???