Zhang Hua is a college student who has just started working. He bought a computer worth 6,600 yuan by installment payment. He only paid 3,000 yuan on the spot, and paid the rest in 2 years. How much does he have to pay on average every month?
张华是一名刚参加工作的大学生，他用分期付款的形式买了一台价值6600元的电脑，当场只付了3000元，余下的部分用2年时间付清．他平均每月还要付多少元？
<gadget id="calculator">6_600 - 3_000</gadget>
<output>3_600</output>

<gadget id="calculator">3_600 / 24</gadget>
<output>150</output>

<result>150</result>