Arestaurant offers special prices for groups dining together. for a buffet dinner, the restaurant charges $10.00 for one person, $20.00 for two people, $29.00 for three people, $37.00 for four people, $44.00 for five people, and so on. how much does a buffet dinner for 8 cost?

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.