Can you solve D1 help me please?

My result was -1.20 but it was wrong

Thank you!

Use the graph for Yolanda's Frozen Yogurt Stand to answer the questions that follow. Use the midpoint formula to calculate the price elasticity of demand for D1 between pointA and point C and the price elasticity of demand for D2 between point A and point B. Price elasticity of demand for D1 =D (Enter your response rounded to two decimal places. Be sure to include the minus sign.) Price (dollars per cone) 4.00 3.75 3.50 3.25 3.00 2.75 2.50 2.25 2.00 1 .75 1 .50 1 .25 1 .00 0.75 0.50 0.25 is E15 0.00 0.0 10.0 t I 20.0 30.0 Quantity (cones per day) 46.0