Mr. Sun bought back a laptop computer with a price of 9,000 yuan from the computer company, and agreed to pay 3,000 yuan as the first payment, and then pay the balance in three months, and pay off the interest of 3% of the balance every month. How much does Mr. Sun need to pay in total?
孙老师从电脑公司买回一台价格为9000元的手提电脑，约定首期付款3000元，以后分三个月付完余额，并每月付清余额的3%的利息．孙老师共需付款多少元？
<gadget id="calculator">3 / 100</gadget>
<output>3/100 = around 0.03</output>

<gadget id="calculator">6_000 * (3/100)</gadget>
<output>180</output>

<gadget id="calculator">4_000 * (3/100)</gadget>
<output>120</output>

<gadget id="calculator">2_000 * (3/100)</gadget>
<output>60</output>

<gadget id="calculator">9_000 + 180 + 120 + 60</gadget>
<output>9_360</output>

<result>9_360</result>