The cost of nitrogen per pound in ammonium nitrate is $0.79. Now let's calculate the cost of nitrogen per pound for urea:
- 46.7% is equivalent to 0.467, and a ton is equivalent to 2000 lb. Therefore, urea contains 0.467 N and costs $630 per 2000 lb.
- Multiply 0.467 N by 2000 lb to get the total amount of nitrogen in pounds: 934 lb of N.
- Divide $630 (the cost per 2000 lb) by 934 lb to get the cost of nitrogen per pound: $0.67 per lb of N.