Mark is selling gourmet apples at a price of ​$2 per pound. ​ currently, he sells 100 pounds of apples per week. this​ week, mark raises his price to ​$3​, and his sales of apples fall to 75 lbs. ​mark's initial revenue from apple sales was ​$ nothing. ​mark's new revenue from apple sales is ​$ nothing. since​ mark's revenue increased when the price of apples​ rose, the demand for​ mark's gourmet apples must be ▼ elastic unitary inelastic .