When the price of a bicycles from 220 to $100 and other things remain the same 1. the quantity demanded of bicycles increases from 150 to 250 an hour 2 the quantity demanded of saboards decreases from 125 to 75 an hour and 3. the quantity demanded of bicycle helmets increases from 170 to 230 an hour With knowledge of the cross elasticity of demand for bicycle helmets with respect to bicycles and the cross elasticity of demand for skateboards with respect to bicycles, the owner of a business that sells bicycle helmets and bicycles O A. can calculate the effect of a change in a price of a bicycle on his competition that sell skateboards O B. can determine the price of a bicycle that maximizes his revenue from bicycle helmets and bicycles OC. can calculate the quantity of skateboards supplied D. can calculate the quantity of bicycle helmets supplied O E Both A and are correct O