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Unitary Method
Last updated at Sept. 26, 2018 by Teachoo
Ex 12.3, 10 Raju purchases 10 pens for Rs 150 and Manish buys 7 pens for Rs 84. Can you say who got the pens cheaper?For Raju, Cost of 10 pens = Rs 150 Cost of 1 pen = Rs (150/10) = Rs 15 For Manish, Cost of 7 pens = Rs 84 Cost of 1 pen = Rs (84/7) = Rs 12 Since cost of 1 pen for Manish is cheaper, ∴ Manish got the pens for a cheaper price.