In order to calculate the overall magnification of a compound microscope we have to multiply the magnification of an objective lens with the magnification of the eye piece
Given:
Magnification of objective lens = 5
magnification of eyepiece = 30
So magnification of compound microscope = Magnification of objective lens X magnification of eyepiece
magnification of compound microscope = 5 X 30 = 150
Hence answer is 150