If a resident buys 8,000 yuan of two-year treasury bonds with an annual interest rate of 10.5%, how much will he get in total in principal and interest after two years?
一居民购买二年期国债8000元，年利率10.5%，二年后可得到本金和利息共多少元？
<gadget id="calculator">10.5 / 100</gadget>
<output>0.105</output>

<gadget id="calculator">8_000 * 0.105 * 2</gadget>
<output>1_680</output>

<gadget id="calculator">8_000 + 1_680</gadget>
<output>9_680</output>

<result>9_680</result>