The price of tea being increased by 20% , a man reduces his consumption by 20% . by how much percent will his
expenses for tea be decreased ?
Let original consumption = 100 units and original price = Rs. 100 per unit
Original expenditure = Rs. 100 x 100 = Rs. 10000
New expenditure = Rs. 120 x 80 = Rs. 9600
`:.` Decrease in expenditure = `(400/10000 xx 100)`% = 4 %
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