Question

The shape of an toy is a right circular cylinder with a hemisphere on bottom and a right circular cone on the top. The radius of the cylindrical part is 8 cm and the height of the cylinder part is 2.125 times the radius. What is the total height of the toy, if the surface area of the toy is 1684 `4/7`   cm². 

A 60cm
B 40cm
C 30cm
D 28cm
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