Three debts, 200 extra a month
A store card (900 at 10%, minimum 30), a Visa (4,000 at 24%, minimum 100) and a personal loan (6,000 at 12%, minimum 180) with 200 extra means paying 510 a month. The avalanche clears everything in 25 months with 1,817.67 of interest; the snowball takes 26 months and 1,970.23, but the store card is gone in month 4.