To be able to take her dream vacation, Martina decides to save for 4 years. She opens a savings account with $800. The account pays simple interest at an
annual rate of 6%. She doesn't make any more deposits.
Answer the following questions. If necessary, refer to the list of financial formulas,
(a) How much total interest will Martina earn?
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(b) What will the total amount in the account be (including interest)?

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.