A pulse oximeter is a device that attempts to determine the oxygen saturation of arterial blood, by measuring the intensity of light that diffuses across peripheral tissue like a fingertip or earlobe. For simplicity, assume that the oxygen saturation of the blood on the arterial side of the capillaries is 100%, and for the venous side is 60%. Also assume that the blood-volume fractions of both sides of the capillaries are equal. If the blood-volume fraction for the arterial side fluctuates by +/- 5% from its mean value as a result of blood-pressure variations with the pulse (and the blood-volume fraction of the venous side is constant), what will be the percent size of the measured fluctuations detected in diffusely transmitted light at 800 nm, if the average effective photon path length is 2 cm?