The annual interest rate of a bank is 10%, and the principal is $1000 deposited today; if compound interest and simple interest are calculated respectively, how much is the difference in the balance after two years?
某银行之年利率为10%，今以本金$1000存入；若分别以复利及单利计算，两年后之结存相差多少元？
<gadget id="calculator">10 / 100</gadget>
<output>1/10 = around 0.1</output>

<gadget id="calculator">1 + (1/10)</gadget>
<output>11/10 = around 1.1</output>

<gadget id="calculator">(11/10) ** 2</gadget>
<output>121/100 = around 1.21</output>

<gadget id="calculator">1_000 * (121/100)</gadget>
<output>1_210</output>

<gadget id="calculator">1_000 * (1/10) * 2</gadget>
<output>200</output>

<gadget id="calculator">1_000 + 200</gadget>
<output>1_200</output>

<gadget id="calculator">1_210 - 1_200</gadget>
<output>10</output>

<result>10</result>