A number is the same as the integer part of 16.2. The first digit of the decimal part is half of the integer part, and the second digit is the largest single digit. What is this number?
一个数与16.2的整数部分相同，小数部分第一位是整数部分的一半，第二位是最大的一位数，这个数是多少．
<result>16.89</result>