the coefficient of elasticity of supply of a commodity is 3 . a seller supplies 20 units of this commodity at  a price of rupees 8 per unit . how much quantity of this commodity will the seller supply when the price rises by rupees 2 per unit ? calculate the quantity when the elasticity of supply is given .  ( experts please give the answers with same numbers which is provided in question don’t change the numbers and don’t provide any link .)