You want to put $2,000 in a simple intrest account. it has a 2.5% annual interest rate. how long will it take you to earn $500 in interest
a: 1 years b: 6.25 years c: 10 years d: 25 years

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.