9. A garden shop determines the demand function q=D(x)=5x+40020x+11 during early summer for tomato plants where q is the number of plants sold per day when the price is x dollars per plant. (a) Find the elasticity. (b) Find the elasticity when x=2. (c) At $2 per plant, will a small increase in price cause the total revenue to increase or decrease? SX 4 400 20 *+11 (a) The elasticity is (b) When x=2, the elasticity is (c) At $2 per plant, a small increase in price will cause the total revenue to