21.
according to the law of demand, what role do low prices serve for buyers?
a) the price of ink cartridges goes up.
b) the price of ink cartridges drops.
c) the demand for ink cartridges goes up.
d)the demand for ink cartridges drops.

i think the answer to question 21 is b).

22.
according to the law of demand, what role do low prices serve for buyers?
a) supply
b) reward
c) substitute
d) penalty

i think the answer to question 22 is also b).

check my answers! i am willing to give a brainliest for the best answer! : )