Question

a hemispherical bowl is made of brass has inner diameter 10.5cm find the cost of tin plating it on the inside at the rateof rupees 16 per 100 cm square

Answer 1

hope this helps you...

Answer 2

radius=5.25cm
curved surface area of hemisphere
=2*22/7*5.25^2
=44*5.25*0.75
=173.25 square cm

Rate for 1 square cm =₹ 16/100
Therefore total cost for plating =173.25*16/100
= ₹ 27.72