Java joe's operates a chain of coffee shops. the company pays rent of $12,000 per year for each shop. supplies (napkins, bags, and condiments) are purchased as needed. the manager of each shop is paid a salary of $2000 per month, and all other employees are paid on an hourly basis. relative to the number of customers for a shop, the cost of rent is which kind of cost.-fixed cost-variable cost-mixed cost-relevant cost

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