Tom invests $10,000 in a savings account that offers 3.5 percent interest, compounded continuously.
in 10 years tom will have earned $ in interest, and in years the investment will double. (use the rule of 70 where required.)

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