How much money did a farmer borrowed at 8% per year if, at the end of 4 years, he had repaid $7,392, which included the interest? (You are given the amount, rate, and time.) Please also include the solution on how you got the answer, it’s urgent.

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.