Hi Learner, Thanks for writing your query! Please find the solved answers of your questions. We are always happy to help the true learners.  Pls. Let us know if we can help you further! Sending wishes to you 😊 Work hard.... Work Better....  Keep learning.... Keep Improving.... Questions for Practice: 1. Suppose the price of a commodity falls from ₹6 to ₹4 per unit and due to this quantity demanded of the commodity increases from 80 units to 120 units. Find out the price elasticity of demand Solution: Following information is given:   Q = 80 units   Q 1 = 120 units   ΔQ =Q 1 -Q       =120-80       = 40   P = ₹6   P 1 = ₹4 ΔP = P 1 -P      = 4-6      = -2                                              E d =?   Note :   (-) negative sign is prefixed to the formula because price and demand are inversely related. Doing this would bring the value of elasticity of demand