Given the on-going pandemic, the sale of Willis cleaning products jumped 15% to Rs. 425 million and increased income by 28%. Household sales surged 7% and profits rose 65% as both prices and demand increased and a germ-averse public stocked up. Assume yourself as an ambitious manager of Willis cleaning products, who wants to use these changes in the 4th quarter to calculate the own-price elasticity of demand. You have the data on changes in price and changes in quantity sold during the quarter.