The table shows how household spending changes with income.
income ($ per month) | spending ($ per month) |
3000 | 3150 |
3300 | 3375 |
3600 | 3500 |
3900 | 3825 |
4200 | 4050 |
4500 | 4275 |
What is the lowest level of income at which savings are positive?
$3000
$3600
$3900
$4200
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