Help! My credit card's APR about to commence~

Hi all, I have a balance of around $2,400, an APR of 16.9% beginning in October. Are they going to charge me interest by doing 2400 x 16.9% - meaning I will have to pay $400 interest in one month and that increases every month.... or is there another calculation that I just have no clue about? I used the financial calculator on which said if I had 2,400 balance and 16.9% APR, I could pay off the balance in about 5 months with only about $100 interest. Please help, I'm just so confused and overwhelmed about possible financial hardships. Credit cards... sneaky traps.
Asked Jun 12, 2014
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Answered Jul 13, 2018
Edited Jul 13, 2018
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Answered Jul 13, 2018

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