Among the simplest fractions whose denominator does not exceed 100, what is the closest to (2/5).
在分母不超过100的最简分数中，与(2/5)最接近的是多少．
<gadget id="calculator">40 / 99</gadget>
<output>40/99 = around 0.40404</output>

<result>40/99 = around 0.40404</result>