Question

Every year, roughly 25,000,000 kg of hair is cut in the United States. Each kilogram of hair contains about 0.0002 kg of zinc, and each kilogram of zinc is worth about $444. How many dollars worth of zinc is contained in hair cut in the United States every year?

Answer 1

20,000

Explanation:

25,000,000 * 0.0002 =5,000

5,000 * 4 = 20,000

Answer 2

The dollars worth of zinc which is contained in hair cut in the United States every year is:

$ 2,220,000

Explanation:

The total kilograms of hair that are cut in the United States are: 25,000,000 kg

Also, the amount of zinc present in 1kg of hair is: 0.0002 kg

Hence, the amount of zinc present in 25,000,000 kg of hair is:

25,000,000×0.0002=5,000 kg

Also, cost of 1 kg of zinc= $ 444

Hence, cost of 5,000 kg of zinc will be: 5,000×444

Hence, cost of 5,000 kg of zinc=$ 2,220,000