Pls answer this

Calculate the numerical value of the coefficient of the price elasticity of demand in each of the following situations. Do not round your interim calculations before obtaining the final solution (i.e. do not clear your calculator). In each case, express the number to two decimal places and do not include a positive or negative sign (i.e. 167, not-17 or +1667). a. Consumer A's purchases of romance novels fall from 4 to 3 per month when their price increases from $10 to $11. The coefficient of the price elasticity of demand is b. Weekly purchases of packs of chewing gum rise from 1.2 million to 1.3 million packs when their price declines from $0.70 to $0.60. The coefficient of the price elasticity of demand is c. A rise in the price of a health supplement from $20 to $25 per bottle reduces the number of bottles sold from 85,000 from 80,000. The coefficient of the price elasticity of demand is d. The annual quantity demanded of tablet computers rises from 200,000 to 300,000 when the price of tablets falls from $400 to $350. The coefficient of the price elasticity of demand is