Thats the fundamental question of pricing - x people will buy at $y and your margin will be $z, but i people will buy at $j and your margin will be $k. Now deci

Thats the fundamental question of pricing - x people will buy at $y and your margin will be $z, but i people will buy at $j and your margin will be $k. Now decide what x, y, i and j are, then find whether z>k.