One day, Xiaoming and Dongdong used the temperature difference to measure the height of the mountain. The temperature measured by Dongdong at the foot of the mountain is 4°C, and the temperature measured by Xiao Ming at the top of the mountain is 2°C. It is known that the temperature in this area drops by 0.8°C every time the altitude rises by 100 meters. How tall is this mountain?
一天小明和冬冬利用温差来测量山峰的高度．冬冬在山脚测得的温度是4℃，小明此时在山顶测得的温度是2℃，已知该地区高度每升高100米，气温下降0.8℃，问这个山峰有多高？
<gadget id="calculator">4 - 2</gadget>
<output>2</output>

<gadget id="calculator">2 / 0.8</gadget>
<output>2.5</output>

<gadget id="calculator">2.5 * 100</gadget>
<output>250</output>

<result>250</result>