Question 550146
Surface Area of hemisphere = 2pir^2

Outside sphere  radius = 10.5  (21/2)

Outside surface area = 2*pi*10.5^2
692.72 cm^2
=

Inner radius = 7 (14/2)

Inner surface area = 2 * pi^7^2
=307.87 cm^2

Total surface area =1000.59 cm^2 

You have to add the rim area 
internal radius = 7 cm 
outer radius = 10.5
Area of rim = pi* (10.5^2-7^2)
=192.42 cm^2

Total = 692.72+307.87 192.42 
=1193.01 cm^2

1193.01* 1.6=Rs.1908.81




m.ananth@hotmail.ca