question_answer

A storage tank consists of a circular a cylinder with a hemisphere adjoined on either end. If the external diameter of the cylinder be 2.8 m and the cost of painting it on the outside at the rate of Rs. 20 per \[{{m}^{2}}\] is Rs. 765.60, then find the height of the circular cylinder.

A)  8.7 m                                                  

B)  2.95 m       

C)  435 m                                                 

D)  5.65 m

E)  None of these