The inside of a hemispherical dome of radius 7 m is to be plastered

MATHEMATICS · Single correct · CBSE · Mathematics · Surface Areas and Volumes · Surface Areas and Volumes

Problem

The inside of a hemispherical dome of radius 7 m is to be plastered. Plastering charges are ₹90 per m

^{2}

for the first 100 m

^{2}

and ₹75 per m

^{2}

for the remaining area. What is the total cost of plastering? (a) ₹25\,600 (b) ₹24\,600 (c) ₹24\,000 (d) ₹26\,220