A person's percentage of body fat can be estimated by weighing the person both in air and underwater, from which the average density \(ho_{\text {avg }}\) can be calculated. A widely used equation that relates average body density to fat percentage is the Siri equation, \% body fat \(=\left(495 / ho_{\text {avg }}\right)-450\), where \(ho_{\text {avg }}\) is measured in \(\mathrm{g} / \mathrm{cm}^{3}\). One person's weight in air is \(947 \mathrm{~N}\) while his weight underwater is \(44 \mathrm{~N}\). What is his percentage of body fat?