Answer:
they are all prime numbers
The current debt ratio here is 45.70%. If you add up all the debts you have 3655.65 which is 45.70% of the total of 8000.
The card that accrues the most interest is the second one, "Cred". To find those amounts multiply the rate by the balance and divide by 12.
5t = 25+2r
t = (25+2r)/5 or
t = 5 + (2/5)r