Your good friend, Mickey, has a difficult time managing his money and often lives paycheck to paycheck

Your good friend, Mickey, has a difficult time managing his money and often lives paycheck to paycheck. Upon finishing his taxes, he was pretty excited because his return showed a tax refund of $2,000. If he had filed electronically, he would have received his tax refund in full exactly 30 days after he filed the return. Because he was desperate for cash, he instead turned to Minnie's EZ-Cash to get a refund immediately. Minnie charged Mickey $200 to advance the tax refund. So, Mickey received $1,800 ($2,000 - $200) immediately and signed an agreement to have his tax refund deposited into EZ-Cash's bank account. Assuming a 360-day year, what is the effective annual rate of interest that Mickey was charged for the tax-refund advance?