Teacher Wang deposits 2,000 yuan in the bank for three years, and the annual interest rate is calculated at 4.2%. When it is due, how much is Mr. Wang's principal and interest?
王老师把2000元存入银行，整存整取三年，年利率按4.2%计算．到期时，王老师的本金和利息共有多少元．
<gadget id="calculator">4.2 / 100</gadget>
<output>0.042</output>

<gadget id="calculator">2_000 * 0.042 * 3</gadget>
<output>252</output>

<gadget id="calculator">2_000 + 252</gadget>
<output>2_252</output>

<result>2_252</result>