Tom and Jerry live in a society in which the first $10,000 of income is taxed at a rate of 10% and any income above $10,000 is taxed at a rate of 20%. Tom's income is $5,000, and Jerry's income is $15,000.

According to this tax system, Tom will pay an income tax of, and Jerry will pay an income tax of.

1. $500 ; $1,500
2. $500 ; $2,000
3. $1,000 ; $2,000
4. $1,000 ; $3,000