In Alaya’s home state, an individual’s income tax is calculated as follows:
• 4% on any portion of income less than or equal to $10,000, plus
• 5% on any portion of income greater than $10,000 but less than or
equal to $30,000, plus
• 6% on any portion of income over $30,000.
The figure shows how the state income tax is calculated for an income of
$42,000. If Alaya paid $3200 in state income tax, what was his income?