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?

Options

A. Rs. 125
B. Rs. 200
C. Rs.250
D. Rs. 500

Answer

C

Explanation

(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.