I am not understanding how to get these answers. I have the formula but do not understand how to get a decimal answer. Can you please walk me through on how to do this exactly?

The diagram at right depicts the demand curve for "miniburgers" purchased from Joe's Campus Grill. Use the information in this diagram to answer the questions that follow. a. What is the price elasticity of demand along the range of the demand curve between a price of $0.40 per miniburger and a price of $0.20 per miniburger? - .18 2.00- (Your answer should have two decimal places and include the correct sign) 1.80- The demand is inelastic -60 b. What is the price elasticity of demand along the range of the demand curve between a price of $1.20 per miniburger and a price of $0.80 per miniburger? - 1 1.40- ( Your answer should have two decimal places and include the correct sign.) 1.20- Price ($ per miniburger) The demand is unit elastic 1.00- 0.80- ..... c. What is the price elasticity of demand along the range of the demand curve between a price of $1.20 per miniburger and a price of $1.60 per miniburger? - 2.33 (Your answer should have two decimal places and include the correct sign.) 0.60- The demand is elastic 0.00+ 0 10 20 30 40 50 60 70 80 90 100 110 Quantity (miniburgers per day)