Every year, roughly 25{,}000{,}00025,000,00025, comma, 000, 000 kilograms (kg)left parenthesis, s, k, g, right parenthesis of hair is cut in the united states. each kilogram of hair contains about 0.0002 \text{ kg}0.0002 kg0, point, 0002, start a text, space, k, g, end text of zinc, and each kilogram of zinc is worth about 444 dollars.