Mingming's father successfully designed a new production line for the factory, for which the factory rewarded him with 9,000 yuan. According to the national tax policy, personal income tax of 1/5 should be paid on the part of personal one-time income exceeding 3,500 yuan. How much bonus did Mingming's father actually get this time?
明明的爸爸成功地为工厂设计出一条新的生产线，为此工厂给他奖励9000元，按国家税收政策规定，个人一次性收入超过3500元部分按(1/5)缴纳个人所得税．这次明明爸爸实际所得的奖金金额是多少？
<gadget id="calculator">9_000 - 3_500</gadget>
<output>5_500</output>

<gadget id="calculator">1 / 5</gadget>
<output>1/5 = around 0.2</output>

<gadget id="calculator">5_500 * (1/5)</gadget>
<output>1_100</output>

<gadget id="calculator">9_000 - 1_100</gadget>
<output>7_900</output>

<result>7_900</result>