household spends rs. 120 on purchase of a commodity when it's price is rs. 6 per unit. When price rises to rs. 10 per unit, his total expenditure on this commodity becomes rs. 180. calculate price elasticity of demand by percentage change method .
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household spends rs. 120 on purchase of a commodity when it's price is rs. 6 per unit. When price rises to rs. 10 per unit, his total expenditure on this commodity becomes rs. 180. calculate price elasticity of demand by percentage change method .
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