Xiaohong blows soap bubbles once a minute, exactly 100 bubbles are blown each time. Half of the soap bubbles burst after one minute, and one-tenth of them remain unbroken after two minutes. After two and a half minutes, all the soap bubbles When Xiaohong blows out 100 new soap bubbles for the 100th time, how many unbroken soap bubbles are there?
小红每分钟吹一次肥皂泡，每次恰好吹出100个，肥皂泡吹出之后，经过一分钟有一半破了，经过两分钟后还有十分之一没有破，经过两分半钟肥皂泡全部破了，小红有第100次吹出100个新的肥皂泡的时候，没有破的肥皂泡共有多少个．
<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 / 10</gadget>
<output>1/10 = around 0.1</output>

<gadget id="calculator">100 * (1/10)</gadget>
<output>10</output>

<gadget id="calculator">100 + 50 + 10</gadget>
<output>160</output>

<result>160</result>