Please help me to understand how to correctly input the information, I input what I thought was the answer, but it blanked back to nothing.

10 X 8 Demand 7 PRICE (Dollars per pound) 2 1 0 10 20 40 50 60 80 90 100 QUANTITY (Thousands of pounds of tomatoes) According to the midpoint method, the price elasticity of demand for tomatoes between point X and point Y is approximately * , which suggests that the demand for tomatoes is between points X and Y