Answer:
£25.53
Explanation:
The surface area of a cylinder is 2πr^^2+2πrh, where r is the radius and h is the height.
In this case, the radius is 3.5 m and the height is 13 m, so the surface area is 2π(3.5)^2+2π(3.5)(13)=245.5 m^2
Each tin of paint covers 50 m$^2$, so we need
245.5/50 =4.91 tins of paint. Each tin costs £5.20, so the total cost of the paint is 4.91×£5.20=£25.53.
Therefore, the minimum cost of painting the rod is £25.53.