After purchasing a coffee cup from your local gas station for $5.00, you can always refill your cup for $0.50. The marginal cost of your 10th cup of coffee purchased at the gas station is:a.$5.00. b.$5.50. c.$0.50. d.$10.00.

Acompany manufactures x units of product a and y units of product b, on two machines, i and ii. it has been determined that the company will realize a profit of $3 on each unit of product a and $4 on each unit of product b. to manufacture a unit of product a requires 7 min on machine i and 5 min on machine ii. to manufacture a unit of product b requires 8 min on mchine i and 5 min on machine ii. there are 175 min available on machine i and 125 min available on machine ii in each work shift. how many units of a product should be produced in each shift to maximize the company's profit p?