A drop in the price of lemons from Rs 100 per kg to Rs 60 Per Kg increases the quantity demanded from 1.75 to 7 kg per week. Calculate the price elasticity of demand

A drop in the price of lemons from Rs 100 per kg to Rs 60 Per Kg
increases the quantity

demanded from 1.75 to 7 kg per week. Calculate the price elasticity of
demand