Ah you have some work to show us, so please show it. Please understand that it is not fair for you to want me to calculate how many cans of paint is...
No it is not OK, we do not do homework for students. Just find the formula for the surface area of a cone that has h in it. Google it. It won't hurt....
Fine you showed some work. Now can you please show some work using a formula for the surface area that involves the height. After all you can't solve...