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The monthly electricity bill raised by the municipal corporation consists of two parts-a fixed charge for providing the service and a variable charge which is directly proportional to the number of watts of power consumed. An amount of Rs. 500 is charged for consuming 125 watts in a particular month . The of 500 watts is `21 : 25` . How much is the fixed charge per month?A. Rs. 125B. Rs. 200C. Rs.250D. Rs. 500 |
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Answer» Correct Answer - C (i) Let x be the fixed charge and y be the variable charge. (ii) Given data can be expressed as x + 100y. ` = 300.(x+300y)/(x +400y) = 5/6`. (iii) Solve the above two equations and get the value of x. |
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