Mom has deposited a sum of money in the bank for a period of one year, with an annual interest rate of 2.25%. After one year expires, she withdraws 45 yuan from the bank and continues to deposit the principal in the bank. How much is the principal deposited in the bank by mother?
妈妈在银行存了一笔钱，定期一年，年利率是2.25%，一年到期后，她从银行取出45元，继续把本金存入银行，妈妈存入银行的本金是多少？
<gadget id="calculator">2.25 / 100</gadget>
<output>0.0225</output>

<gadget id="calculator">45 / 0.0225</gadget>
<output>2_000</output>

<result>2_000</result>