1.

The inner, length, breadth and height of an open box are 95cm, 75cm and 97.5 cm respectively. If the wood is 25 mm thick the cost of painting outside of the box(the bottom is not to be painted) at 50 paise per 100 sq. cm is :

Answer» inner length`= 95 cm`
inner breadth `= 75cm`
outer length`= PQ= AB+ 2 + (2.5)`
`= 95+5 = 100cm`
outer breadth = `AD+ 2(2.5) = 80cm`
outer height =`97.5+2.5 = 100cm`
Surface area of wall = `2(l+h+ b+h)`
`= 2[100 xx 100 + 80 xx 100]`
`= 3600 cm^2`
total cost =`36000/100 xx 0.5`
`= 180rs`
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