Question

a closed box measure 2m by 1.5 m by 1 and externally find the cost of painting it's outside at rs. 2.30 per square metre (the bottom is not to be printed)

Answer 1

T s a of cylinder =2 (lxb + bxh +hxl)
=2(2x1.5 + 1.5 x 1 +1x 2)
=2(3+1.5+2)
=2(6.5)
=13 m sq
Cost of painting =13 x 2.3
=29.9 rs