Rounding Error

A number is uniformly chosen from $[0.15, 0.25]$. It was rounded to two decimal places and then to one decimal place. The probability that the final value is $0.2$is $X \%$. What is $X?$

Assumption:用舍入"half away from zero". That is, if the number is equally far from the two closest numbers, choose the one away from zero. For example, 2.5 is equally far from 2 and 3, so round 2.5 to 3.