A family pays Rs. 1000 for electricity on an average in those months in which it does not use a water heater. In the months in which it uses a water heater, the average electricity bill is Rs. 1240. The cost of using the water heater is Rs. 8.00 per hour. Find the average number of hours the water heater is used in a day

2 hours

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1 hour

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5 hours

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4 hours

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Solution

The correct option is C 1 hour
$E x t r a E l e c t r i c i t y c h a r g e s b e c a u s e o f w a t e r h e a t e r i n a m o n t h = R s 1240 - 1000 = R s 240 C o s t o f e l e c t r c i t y / h r = R s 8 T o t a l h r s h e a t e r w a s u s e d i n a m o n t h = 240 / 8 = 30 h r s S o n o o f h r s w a t e r h e a t e r u s e d i n a d a y = 30 / 30 = 1 h r$

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The correct option is C 1 hourExtraElectricitychargesbecauseofwaterheaterinamonth=Rs1240−1000=Rs240Costofelectrcity/hr=Rs8Totalhrsheaterwasusedinamonth=240/8=30hrsSonoofhrswaterheaterusedinaday=30/30=1hr