I don't understand where I made a mistake.

e. none of the above Suppose that as the price of Y falls from $2.00 to $1.90 the quantity of Y demanded increases In 18 - 3.90 4. price elasticity of demand is: ACd - ED 228 . 0, 10 a. 4,00 SQd - AP 70. 2 b. 3.94 - 3,0 c. 2.09 22.5 d. 1.37 none of these If a product has very few substitutes, the price elast of demand is likely to be