求年利率的数学题：小明把1000元压岁钱存入银行，两年后取出本金和利息后一共1043.2元。你知道年利率是多少吗？（利息税按20%计算）

数学题解答：要注意存期是两年，先算出实得利息，再算出扣税前的利息，再用利息除以存的年数和本金。

1043.2-1000=43.2 （元）

43.2÷(1-20%)＝54（元）

54÷2÷1000=2.7%

答：年利率是2.7%。

推荐阅读：
5 Tips for Staying Safe Online　 10 Signs Your Blog is Working　 The Key to Risk-Free Cloud-Based IT Equipment Shipping　 Bring Your Multi-Site Development Work To The Next Level With A 　 
How to Create Killer SEO Content on a Budget　 Learn to Achieve Your Goals with 5 Secrets of Great Bloggers　 What is Cornerstone Content And Why It’s Important　 How to Attract Female Readership For Your Blog　 Double your traffic with White Hat SEO techniques　 Blogging As Therapy: True Life Stories Of Victims And How They C