Question:The diameter and the slant height of a conical tomb are `28` m and `50` m respectively. The cost of whitewashing its curved surface at the  rate of `80` paise per square metre is : 

A `Rs. 2640` 
B `Rs.1760` 
C `Rs.264` 
D `Rs. 176` 

+ Answer
B 

+ Explanation
`r = 14` m and `1 = 50 m.`

:. Area of curved surface 

`= π r/ = (22/7 xx 14 xx 50) m^2`

`= 2200 m^2.`

:. Cost of white washing 

`= Rs. (2200 xx 80/100)`

`= Rs. 1760.`

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Irin Moni

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