| Work out the numbers both ways. Paying off the high interest account first (your numbers): Paid $150 total. 20% account interest: $0 15% account interest: $150.02 Debt has increased by $0.02 (after one month) Paying off the low interest account first: Paid $150 total ($3.57 + $146.43) 20% account interest (on $115.50) : $23.10 15% account interest (on $884.57) : $132.69 Debt has increased by $5.79 (after one month) Bottom line: high interest debt grows faster than low interest debt. BTW, I understand why people might want to pay off small loans first, I have done it myself. It's nice to have one less bill, one less headache, etc. But financially it's not the best thing to do.
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