7. A bus stop is barricated from the remaining part of the road by using
50 hollow cones made of recycled cardboard. Each one has a base
diameter of 40 cm and height 1 m. If the outer side of each of the cones
is to be painted and the cost of painting is 25 per m", what will be the
cost of painting all these cones? (Use a = 3.14 and V1.04 = 1.02.)
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