The ratio of change in price `(DeltaP)` to original price (P) is 0.4 and elasticity of demand is (-) 1.50 . Calculate the percentage change in demand.

In case of commodity 'B' the ratio of change in pirce (DeltaP) to original price (P) is (-) 0.4. if price elasticitly of demand is (-) 0.5, calculate the percentage change in quantity demanded.

If ratio of Change in quantity (DeltaQ) to original quantity Q is 0.5 and elasticity of demand is (-) 1.25, calculate the percentage change in price.

The ratio of change in price (DeltaP) to original price (P) for a commodity is 0.6. If price elasticity of supply is 1.5 ,calculate the precentage change in supply .

If ratio of change in quantity (AQ) to original quantity (Q) is 0.4 and elasticity of supply is 1.25, calculate the percentage change in price.

Explain price elasticity of demand.