Which to establish a negative credit history?

a.)make payments on or before the due date.
b.)never miss a payment.
c.)pay off the full amount with the first monthly statement.
d.)pay less than the minimum amount due.

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