Xiaohua's father deposited 50,000 yuan in the bank in 2008, with a deposit period of 3 years and an annual interest rate of 3.5%. After the maturity in 2011, he took out the money and continued to deposit the principal in the bank for a period of 3 years with an annual interest rate of 5%. How much is the difference between the two interest rates?
小华的爸爸在2008年把50000元钱存入银行，存期3年，年利率3.5%．2011年到期后他把钱取出后，继续把本金存入银行，存期3年，这时的年利率为5%．请问这两次利息相差多少元？
<gadget id="calculator">5 / 100</gadget>
<output>1/20 = around 0.05</output>

<gadget id="calculator">50_000 * (1/20) * 3</gadget>
<output>7_500</output>

<gadget id="calculator">3.5 / 100</gadget>
<output>0.035</output>

<gadget id="calculator">50_000 * 0.035 * 3</gadget>
<output>5_250</output>

<gadget id="calculator">7_500 - 5_250</gadget>
<output>2_250</output>

<result>2_250</result>