The total area of a certain area is 1600km**2, of which 42km**2 is forest area, what is the forest coverage rate of this area?
某地区的总面积是1600km**2，其中有42km**2是森林区，这个地区的森林覆盖率是多少？
<gadget id="calculator">42 / 1_600</gadget>
<output>21/800 = around 0.02625</output>

<gadget id="calculator">100 / 100</gadget>
<output>1</output>

<gadget id="calculator">(21/800) * 1</gadget>
<output>21/800 = around 0.02625</output>

<result>21/800 = around 0.02625</result>