The dimension of box is 19 cm × 21 cm × 23 cm. If the cost of painting 0.25 per sq. cm then find the total cost of painting.

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Solution

Total surface area of box =2(lb+bh+lh)
=2(19 $\times$ 21+21 $\times$ 23+19 $\times$ 23)
=2(399+483+437)
=2(1319)
=2638 cm $^{2}$
Cost of painting 1 sq. cm = ₹ 0.25
Total cost of painting =2638 $\times$ 0.25 = ₹ 659.5
Hence, total cost of painting is ₹ 659.5

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The dimension of box is 19 cm × 21 cm × 23 cm. If the cost of painting 0.25 per sq. cm then find the total cost of painting.

Total surface area of box =2(lb+bh+lh) =2(19×21+21×23+19×23) =2(399+483+437) =2(1319) =2638 cm2 Cost of painting 1 sq. cm = ₹ 0.25 Total cost of painting =2638×0.25 = ₹ 659.5 Hence, total cost of painting is ₹ 659.5

Total surface area of box =2(lb+bh+lh)
=2(19 $\times$ 21+21 $\times$ 23+19 $\times$ 23)
=2(399+483+437)
=2(1319)
=2638 cm $^{2}$
Cost of painting 1 sq. cm = ₹ 0.25
Total cost of painting =2638 $\times$ 0.25 = ₹ 659.5
Hence, total cost of painting is ₹ 659.5