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Say for example I charged somthing for 80.00 and pay instalments of 30.00 a month. The credit card has a 29.99 APR. Would I be paying a lot in interest?
Roughly $4 (rounded up).
In actual dollar amount 2.5% per month on the unpaid balance - some lenders use an average daily balance method which up's the cost some. So on $80 + $2.50 first month less $30 = $50 + 2.50 = $52.50 second month less $30 + $1.31 = $23.81. (note interest becomes principle for remaining balance for the next month and future interest calculations)
Even if the actual dollar number for interest is not that much on this example ANY account with a 30% APR is outrageous and very expensive to use unless you pay in full 100% each and every month.