Fangfang’s family recently bought a new house with a personal public fund loan of 180,000 yuan from the bank. The term of the loan is due in ten years. How much interest will they have to repay in total? (Annual interest rate of personal provident fund loan project less than five years including five years is 4%, and annual interest rate of more than five years is 4.5%)
芳芳家最近买了一套新房用个人公基金向银行贷款18万元，货款期限十年到期，共要还利息多少元？(个人公积金贷款项目五年以下含五年年利率4%，五年以上年利率4.5%)
<gadget id="calculator">18 * 10_000</gadget>
<output>180_000</output>

<gadget id="calculator">4.5 / 100</gadget>
<output>0.045</output>

<gadget id="calculator">180_000 * 0.045 * 10</gadget>
<output>81_000</output>

<result>81_000</result>