Calculate compound interest Question
Mark is saving for his son's college education. If the savings account earns 9% interest compounded quarterly, and he
wants to have $80,000 in 18 years, what must the principal be? Round your answer to the nearest dollar.
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An office supply company conducted a survey before marketing a new paper shredder designed for home use. in the survey, 80 % of the people who tried the shredder were satisfied with it. because of this high satisfaction rate, the company decided to market the new shredder. assume that 80 % of all people are satisfied with this shredder. during a certain month, 100 customers bought this shredder. find the probability that of these 100 customers, the number who are satisfied is 69 or fewer.

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