Mom deposits 4,000 yuan in the bank for one year on a regular basis, with an annual interest rate of 2.25%. After the maturity, the bank will deduct 20% of the personal interest tax. How much can the mother get back from the bank when the interest is due?
妈妈将4000元存入银行，定期一年，年利率是2.25%，到期后银行要扣个人20%的利息税，那么到期时妈妈可以从银行取回利息多少元？
<gadget id="calculator">2.25 / 100</gadget>
<output>0.0225</output>

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

<gadget id="calculator">1 - (1/5)</gadget>
<output>4/5 = around 0.8</output>

<gadget id="calculator">4_000 * 0.0225 * 1 * (4/5)</gadget>
<output>72</output>

<result>72</result>