A compound microscope has an objective lens with a focal len

A compound microscope has an objective lens with a focal length of 2.0 cm and an eyepiece with a focal length of 3.8 cm. If the image produced by the objective is 22 cm from the objective, what magnification does this microscope produce? (Include the sign.)

Magnification of Objective: -(22-focal length)/focal length =- 20/2 = -10

Magnification of eye-piece: 25/focal length = 25/3.8 = 6.58