A cookie making company is trying to found out which of their cookies is the favorite among their 920 known customers. 80 customers are selected at random and asked which type of cookie they prefer, and this process is repeated 3 times. If 36 of the customers preferred mint cookies during the first sample, 33 preferred mint during the second sample, and 37 preferred them during the third, what is the most accurate estimate to how many of the company's customer's favorite cookie is mint? a. About 414 of the customers
b. About 406 of the customers
c. About 380 of the customers
d. About 426 of the customers

Wo firms, a and b, each currently dump 50 tons of chemicals into the local river. the government has decided to reduce the pollution and from now on will require a pollution permit for each ton of pollution dumped into the river. it costs firm a $100 for each ton of pollution that it eliminates before it reaches the river, and it costs firm b $50 for each ton of pollution that it eliminates before it reaches the river. the government gives each firm 20 pollution permits. government officials are not sure whether to allow the firms to buy or sell the pollution permits to each other. what is the total cost of reducing pollution if firms are not allowed to buy and sell pollution permits from each other? what is the total cost of reducing pollution if the firms are allowed to buy and sell permits from each other? a. $3,000; $1,500 b. $4,500; $3,500 c. $4,500; $4,000 d. $4,500; $2,500