Xiaohong deposits the New Year's money in the bank, calculated at an annual interest rate of 3.7%, and the interest due after two years is 185 yuan. How much is Xiaohong's principal deposit?
小红把压岁钱存人银行，按年利率3.7%计算，两年后应得利息185元．小红存入的本金是多少元？
<gadget id="calculator">3.7 / 100</gadget>
<output>0.037</output>

<gadget id="calculator">185 / 2 / 0.037</gadget>
<output>2_500</output>

<result>2_500</result>