After the Spring Festival in 2006, Xiaoxiao deposited 15,000 yuan in the bank for a period of 3 years, with an annual interest rate of 1.8%, and 20% interest tax on the interest earned. How much is the after-tax interest at maturity?
2006年春节过后，笑笑把15000元钱存入银行，存期3年，年利率1.8%，所得的利息要付利息税20%．到期可得税后利息多少元？
<gadget id="calculator">1.8 / 100</gadget>
<output>0.018</output>

<gadget id="calculator">15_000 * 0.018 * 3</gadget>
<output>810</output>

<gadget id="calculator">20 / 100</gadget>
<output>1/5 = around 0.2</output>

<gadget id="calculator">810 * (1/5)</gadget>
<output>162</output>

<gadget id="calculator">810 - 162</gadget>
<output>648</output>

<result>648</result>