A cylindrical water tank which is open on the top side has a height h meters and a diameter 21 m. The cost of plastering the tank is ₹1,36,125 at the rate of ₹275/m², then find the height of the tank. (π = \(\frac{22}{7}\) )
1
2.25 m
2
5.5 m
3
7.5 m
4
4.5 m