Mom has deposited 20,000 yuan in regular savings in the bank. If the annual interest rate is 3.85%, how much is the total amount of principal and after-tax interest when the deposit is completed for 5 years? (interest tax 5%)
妈妈在银行存了定期储蓄2万元，如果年利率是3.85%，存满5年时，本金和税后利息共多少元？(利息税5%)
<gadget id="calculator">2 * 10_000</gadget>
<output>20_000</output>

<gadget id="calculator">3.85 / 100</gadget>
<output>0.0385</output>

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

<gadget id="calculator">1 - (1/20)</gadget>
<output>19/20 = around 0.95</output>

<gadget id="calculator">20_000 * 0.0385 * 5 * (19/20)</gadget>
<output>3_657.5</output>

<gadget id="calculator">20_000 + 3_657.5</gadget>
<output>23_657.5</output>

<result>23_657.5</result>