A factory used 100 tons of coal in the first half of the year and 80 tons of coal after improving the boiler in the second half of the year. Calculated at 380 yuan per ton of coal, how much is the coal saved in the second half of the year compared to the first half of the year?
某工厂上半年用煤100吨，下半年改进锅炉后用煤80吨，按每吨煤380元计算，下半年比上半年用煤节约了多少元？
<gadget id="calculator">100 * 380</gadget>
<output>38_000</output>

<gadget id="calculator">80 * 380</gadget>
<output>30_400</output>

<gadget id="calculator">38_000 - 30_400</gadget>
<output>7_600</output>

<result>7_600</result>