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A mobile company offers two plans. The plan A costs Rs.300 and offers 1100 free minutes per month with a charge of 15 paise per minute for every additional minute. Plan B costs Rs. 400 and offers 1300 free minutes per month with a charge of 10 paise per minute for every additional minute. Let x and y represent the total cost per month for the plan A and the plan B respectively, where t represents the number of minutes used. If Sneha uses 2500 minutes per month, then what will be the value of x-y ? |
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Answer» x = 300 + 0.15 (2500 - 1100) = 300 + 0.15 x 1400 = 300 + 210 = 510 y = 400+ 0.10 (2500 - 1300) = 400 + 0.10 x 1200 = 400 + 120 = 520 ∴ x - y = 510 - 520 = -10 |
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