The difference between a time draft and a sight draft is that:

a. a time draft is payable at a definite future time, whereas a sight draft is payable when it is presented to the drawee.
b. a time draft is payable when presented to the drawee for payment, whereas a sight draft is payable at a definite future time.
c. there is no difference.

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?