Sam makes solar-powered cell phone battery chargers. in february, he sells chargers for $20 each. in march, he sells the chargers for $15 each. what would happen to the quantity demand for chargers because of the change in price?

A curve that displays the association between the price level of a good and the quantity of the good demanded at that price is called the demand curve. It states that if price increases, the demand for the good will decrease. There is an inverse relationship. So in this problem, since he decreased the price of the charger, the demand for the charger will be higher; generating more sales.