The annual interest rate of a one-year time deposit is calculated at 2.25%. Naughty has deposited some money in the bank, which will mature in May this year. After deducting the 20% interest tax, he actually received an interest of 72 yuan. Calculate how much money Naughty has deposited in the bank?
一年定期存款年利率按2.25%计算，淘气在银行存了一些钱，今年5月份到期，扣除20%的利息税后，他实际得到利息72元．算一算淘气共存入银行多少钱？
<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">0.0225 * (1/5)</gadget>
<output>0.0045</output>

<gadget id="calculator">0.0225 - 0.0045</gadget>
<output>0.018</output>

<gadget id="calculator">72 / 0.018</gadget>
<output>4_000</output>

<result>4_000</result>