# A bus stop is barricaded from the remaining part of the road, by using 50 hollow cones made of recycled cardboard . each one has a base diameter of 40cm and hieght 1 metre . if the outer side of each of the conesis to be painted and the cost of painting is Rs 12 m2, what will be the cost of painting all these cones ? (use pie= 3.14 and take root1.4 = 1.02)

$curved\;surface\;area\;of\;a\;cone=\pi \times r\; l\\*where,\; r=radius\;of\;the\;base\;of\;thr\;cone(r=0.2\;m)\\*\indent \indent l=slant\;height\;of\;the\;cone(l=?)\\*h=1\;m\\* l=\sqrt{h^2+r^2}=\sqrt{1+0.04}=\sqrt{1.04}=1.02\;m\\* curved\;surface\;area\;of\;1\;cone=\pi \times r\times l\\* curved\;surface\;area\;of\;50\;cone=50\times \pi\times r\times l\\* curved\;surface\;area\;of\;50\;cone=50\times \pi \times 0.2 \times 1.02\;m^2\\* curved\;surface\;area\;of\;50\;cone=32\;m^2\\* Now,\;cost\;of\;paint\;for\;1\;m^2=Rs\;12\\* cost\;of\;paint\;for\;32\;m^2=Rs\;12\times 32=Rs\;384\\* Hence,\;painting\;cost\;for\;all\;cones\;is\;Rs\;384$

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