Diane has ridden 28 miles of a bike course. The course is 40 miles long. What percentage of the course has Diane ridden so far? pls actually help me

At a pizza shop 70% of the customers order a pizza 25% of the customers order a salad and 15% of the customers order both a pizza and a salad if s customer is chosen at random what is the probability that he or she orders either a pizza or a salad