A painting is bought on 15/01/1990 for 1 million and sold on 05/05/2002 for 2 million. The basis is daily balance calculation (basis = 3). What is the average annual level of interest?
一幅画于 1990 年 1 月 15 日以 1 百万买入，并于 2002 年 5 月 5 日以 2 百万卖出。如果计算精确到日 (基数 = 3)。平均年利率为多少？