Xiao Ming blows soap bubbles once every minute, exactly 100 soap bubbles are blown out each time. After the soap bubbles are blown out, half of them burst after 1 minute, and (1/20) of them remain unbroken after 2 minutes, and all the soap bubbles burst after 3 minutes. When Xiao Ming blows out 100 new soap bubbles for the fourth time , how many unbroken soap bubbles are there?
小明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1分钟有一半破了，经过2分钟后还有(1/20)没有破，经过3钟肥皂泡全部破了，小明在第4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 / 20</gadget>
<output>1/20 = around 0.05</output>

<gadget id="calculator">100 * (1/20)</gadget>
<output>5</output>

<gadget id="calculator">50 + 5 + 100</gadget>
<output>155</output>

<result>155</result>