Xiao Ming looks out from the porthole of the plane and sees part of the island, part of the white clouds and a small piece of sea area. Assuming that the white clouds occupy half of the picture, it covers 25% of the island, so the island only occupies 25% of the window picture. What percentage of the window screen is the part of the sea that is not covered by white clouds?
小明从飞机舷窗向外看，看部分海岛，部分白云以及不大的一块海域，假定白云占画面一半，它遮住海岛的25%，因此岛在窗口画面上只占25%．那不被白云遮住那部分海域占窗口画面的几分之几？
<gadget id="calculator">25 / 100</gadget>
<output>1/4 = around 0.25</output>

<gadget id="calculator">1 - (1/4)</gadget>
<output>3/4 = around 0.75</output>

<gadget id="calculator">(3/4) * (1/4)</gadget>
<output>3/16 = around 0.1875</output>

<result>3/16 = around 0.1875</result>