On January 1, 2011, Mr. Zhang bought 40,000 yuan of national bonds in the bank. The deposit period is 5 years, and the annual interest rate is 4.5%. How much should the bank pay Mr. Zhang after the maturity?
张老师2011年1月1日在银行购买国债40000元，存期5年，年利率是4.5%，到期后银行应一共付给张老师多少钱？
<gadget id="calculator">4.5 / 100</gadget>
<output>0.045</output>

<gadget id="calculator">40_000 * 0.045 * 5</gadget>
<output>9_000</output>

<gadget id="calculator">40_000 + 9_000</gadget>
<output>49_000</output>

<result>49_000</result>