What is the sum of all the simplest proper fractions with 100 as the denominator?
以100为分母的所有最简真分数的和等于多少．
<gadget id="calculator">1 / 100</gadget>
<output>1/100 = around 0.01</output>

<gadget id="calculator">99 * 100</gadget>
<output>9_900</output>

<gadget id="calculator">9_900 / 2</gadget>
<output>4_950</output>

<gadget id="calculator">(1/100) * 4_950</gadget>
<output>99/2 = around 49.5</output>

<gadget id="calculator">(99/2) - 29.5</gadget>
<output>20</output>

<result>20</result>