After the numerator of a fraction is reduced to the original (1/2), the decimal is 0.04. How many times can the denominator of the original fraction be expanded into a decimal 0.02.
一个分数的分子缩小到原来的(1/2)后，化成小数是0.04．原分数的分母扩大到原来的多少倍后能化成小数0.02．
<result>4</result>