A person has a demand deposit of 10,000 yuan. If the monthly interest rate of the demand deposit is 0.42%, how much is the total interest and principal of the deposit after 4 months?
某人活期存款10000元，如果活期存款的月利率为0.42%，求存款4个月后的利息和本金一共多少多少元？
<gadget id="calculator">0.42 / 100</gadget>
<output>0.0042</output>

<gadget id="calculator">10_000 * 0.0042 * 4</gadget>
<output>168</output>

<gadget id="calculator">10_000 + 168</gadget>
<output>10_168</output>

<result>10_168</result>