Your function is a constant and given the instructions of rounding it seems likely that you have a typo in your question. Anyway here goes the answer.
Since the function is constant no matter the input x the output is always equal to 0.2% because 0.2% is the only value defined in the range of the function.
[tex]f(1.5)=0.2\%=0.002[/tex]
Hope this helps.
