Mom deposits 1,000 yuan in the bank for a fixed period of one year, with an annual interest rate of 2.79%. If the interest tax is calculated at 5%, how much is the after-tax interest that mother can get when it matures?
妈妈把1000元钱存入银行，定期一年，年利率2.79%，如果利息税按5%计算，到期时妈妈可得税后利息多少元．
<result>26.5</result>