Please explain that question comprehensively where do I need to put the absolute value ?

Given the following information complete the table. Use the mid-point formula to calculate elasticity. 11 x10 Price Qd Ed Characteristic TR 11 * 10 110 10 20 - 7 elastic 9 30 3. 80 elostce 240 40 2. 43 elastic 50 1.67 elosin 350 60 - 1:18 elastic 360 70 inelastic 350 4 80 .60 inelastic 320 90 041 Inelastic 270 income elasticity of downmy. 1 Given the following income elasticity's, classify the goods as normal or inferior? good