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A hemispherical bowl made of brass has an inner diameter 10.5 cm. The cost of plating it on the inside if the rate is Rs. 4 per 100 cm2 is Rs. 6.93.

State true or false.

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True

False

answer is A.

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Detailed Solution

Given, inner diameter = 10.5cm.

r = 10.5 2 = 5.25 cm

The surface area of a hemisphere is,

= 2 π r 2 = 2 π (5.25) 2 = 173.25 cm 2

Cost of plating = Rs. 4 per 100 cm2.
Cost of plating 1 cm2= Rs.

4100

The cost of tin plating

173.25

cm2,

= 4100 × 173.25 = R s .6.93

.
The cost of the plating it on the inside at the rate of Rs. 4 per

100 c m 2

is Rs. 6.93.
Therefore, the given statement is true i.e., the cost of plating it on the inside is Rs. 6.93.

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