If the cost of painting 1m2 of wooden board is Rs.5, then the cost of painting a wooden rectangular prism of sides 4m,3m and 5m.
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Given : the cost of painting 1 m² of wooden board is Rs. 5,
To Find : the cost of painting a wooden rectangular prism of sides 4 m, 3 m, and 5 m
(a)300
(b)340
(c)470
Solution:
Surface area of rectangular prism
= 2( 4 * 3 + 4 * 5 + 3 * 5)
= 2( 12 + 20 + 15)
= 2(47)
= 94 m²
Cost of painting 1 m² = Rs 5
Cost of painting 94 m² = 94 x 5 = 470 Rs
Rs 470 is correct answer
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Step-by-step explanation:
400 correct
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