math
posted by scott on .
thanks anyone!
A right prism has a polygonal base with n sides. Each side has a length of 5 in. The altitude of the prism is 20 in.
If the base had n+1 sides, each still having a side of length 5 in, by how much, in square inches, would the lateral area of the prism increase by? Express your answer as a number only.

by 100 in