Question

A open box is made of wood 3 cm thick. its external length,breadth, and height are 1.48 m, 1.16 m and 8.3 dm. find the cost of painting the inner surface at ₹ 50 per square metre.

Answer 1

hii..



frnd...



internal dimensions=external dimensions - thickness....


internal...

lenght=1.48-0.03=»1.45m

breadth=1.16-0.03=»1.13m

height=0.83-0.03=»0.80m
(1dm=1/10m)


....



internal area of box=2(lb+bh+hl)
=»2(1.45*1.13+1.13*0.80+0.80*1.45)
=»2(1.6385+0.904+1.16)
=»2*3.7025

$= 7.405 {m}^{2}$

.......



$1 {m}^{2} = 50rupess \\ \\ 7.405 {m}^{2} = 7.405 \times 50 \\ \\ \: \: \: \: \: \: \: = 370.25rupees....$
......

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hope helped....


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