simplifying credit card debt (BETA) from 2006

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I've had a problem understanding credit cards since the first time I was offered one in college. The idea sounds great. You have access to almost infinite money. Furthermore you are told that you have to be in debt in order to have a good credit report later on when you might want to buy a car or house. A major problem in the US now is the inability for many people to pay off their credit card debt. I looked online for some way to better understand how this all works, and wrote this simple little system to have an 'aha' moment. I hope it is useful to you. (Note that this system assumes that there is no annual fee, and that a minimum of $10 must be paid per month if the Minimum Monthly Payment is less than $10).

Credit Card Specs   Balance and Payment
APR   %
APR as Monthly Percentage of Principal   0.85 %
Minimum Monthly
Minimum Pay $ 20 / mo
Interest Earned $ 8 / mo
Principal $

Monthly Payment

Monthly Payment as Percentage of Principal   2.00%
View by: Fixed pay Minimum pay

2017$20$20$20$20$20$20$20$20$20$20$20$20$240 $856
2018$20$20$20$20$20$20$20$20$20$20$20$20$480 $696
2019$20$20$20$20$20$20$20$20$20$20$20$20$720 $519
2020$20$20$20$20$20$20$20$20$20$20$20$20$960 $324
2021$20$20$20$20$20$20$20$20$20$20$20$20$1,200 $107
2022$20$20$20$20$20$9      $1,310 $0