1 A payday loan company charges 2 percent interest for a four-week period. What would be the annual interest rate from that company?

2 Monthly fee, $2.50; processing fee, 20 cents per check; checks written, an average of 18 a month.

3.Interest earnings of 4 percent with a $600 minimum balance; average monthly balance, $900; monthly service charge of $16 for falling below the minimum balance, which occurs four times a year (no interest earned in these months)