There is a small island in the middle of the sea, half of the 100 women living on the island wear only one earring. Half of the remaining women wear two earrings, and the other half wear no earrings. Ask the 100 women how many earrings they wear in total.
大海中有一个小岛，小岛上住着的100名妇女，中有一半人只戴一只耳环．余下的妇女中一半人戴两只耳环，另一半人不戴耳环，问这100名妇女共戴有多少只耳环．
<gadget id="calculator">1 / 2</gadget>
<output>1/2 = around 0.5</output>

<gadget id="calculator">100 * (1/2)</gadget>
<output>50</output>

<gadget id="calculator">1 - (1/2)</gadget>
<output>1/2 = around 0.5</output>

<gadget id="calculator">100 * (1/2) * (1/2) * 2</gadget>
<output>50</output>

<gadget id="calculator">50 + 50</gadget>
<output>100</output>

<result>100</result>