Xiaoming's father's monthly income is 2,500 yuan, and according to regulations, the part of the monthly income exceeding 1,600 yuan is subject to personal income tax at 5%. How much personal income tax does Xiao Ming's father have to pay every month?
小明的爸爸月收入是2500元，按规定月收入超过1600元的部分按5%征收个人所得税．小明的爸爸每个月要交个人所得税多少元？
<gadget id="calculator">2_500 - 1_600</gadget>
<output>900</output>

<gadget id="calculator">5 / 100</gadget>
<output>1/20 = around 0.05</output>

<gadget id="calculator">900 * (1/20)</gadget>
<output>45</output>

<result>45</result>