A cosmetic mirror has a focal length of f = 50 cm. A mascara brush is held at a distance s = 10 cm from the mirror. The location of the image of the brush is given by s' and can be found using the formula below. Knowing s' and given s, the magnification, m of the image can be found using the other formula below. Determine its magnification and round to two decimal places. The answer may be positive or negative.