A shop is fitted with five 40 w fans and four 100 w bulbs.find the cost of using fans for 10 hrs a day and bulbs for 6 hrs each day for 25 days at 30 per unit of electrical energy.
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Explanation:
Qty. Time
40 W fans = 5 10 hrs
100 W bulb = 4 6 hrs
Fans:
40× 5×10×30×25 = 1500000 Rs
100× 4× 6× 30 × 25= 1800000 Rs
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