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A house has four tube-lights, three fans...

A house has four tube-lights, three fans and a television. Each tube-light draws 40 W. The fan draws 80 w and the television draws 100 W. On an average, all the tube-lights are kept on for 5 hours, all fans for 12 hour and the television for 6 hours everyday. Find the cost of electric energy used in 30 days at the rate of Rs. 3.00 per KWH.

Text Solution

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The power used by
1. Four tube-lights of 40 W for hours in 30 days `=4xx40xx5xx30=2400WH`
2. Three fans of 80 W for 12 hours in 30 days `=3xx12xx30=86400WH`
3. One television of 100 W for 6 hours in 30 days `1xx100xx6xx30=1800WH`
4. Total electric energy used `=2400+86400+1800=128400WH`
W.H. converted into K.W.H. = 128.4 K.W.H `[because(128400)/(1000)]`
Cost of 1 unit = Rs. 3.00
Amount to be paid for 128.4 units `= 128.4xx3=Rs.385.20`
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