The radius of the cylindrical tank = 15ft.
Height of the cylindrical tank = 60ft.
We know that the surface area of cylinder =
Here, r = 15ft and h = 60ft.
By placing the values in the formula we will get,
Surface area =
=
=
=
=
=
= , as given
=
We have got the required answer.
Surface area of the tank =
The correct opttion is D.