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An electric heater or a motor of 750W and 1kW are used for domestic purposes for 2 hours and 12 hours per day in the month of January respectively. Calculate the cost of energy used if the unit costs 5.50 .

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511 Rs.

521 Rs.

511.5 Rs.

541 Rs.

answer is C.

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Detailed Solution

Concept: An electric heater is used for domestic purposes and we need to calculate the cost of energy . The formula is

Power Consumed 1 unit = Power \times Time

.
Energy used by electric heater in kWH=

750 \times 1 0^{- 2} \times 2 = 1.5 units

Energy used by motor in kWH

= 1000 \times 1 0^{- 3} \times \frac{3}{2} = 1.5 units

Power Consumed 1 unit = Power \times Time

Total unit is

1.5 + 1.5 = 3 units .

Cost per unit

= 3 \times 5.5 = 16.5

Total cost is equal to

511.5

Hence, the correct option is 3.

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