Charmaine's coffee shop makes a blend that is a mixture of two types of coffee. type a coffee costs charmaine $4.10 per pound, and type b coffee costs $5.60 per pound. this month's blend used four times as many pounds of type b coffee as type a, for a total cost of $1007.00 . how many pounds of type a coffee were used?

number of pounds of type a coffee:

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.