: The correct solution of this question is Si.
√-25=√25 x√-1
√-25=5i (√-1-i)
Multiply both numerator and denominator by 100. We do this to find an equivalent fraction having 100 as the denominator.
0.001 100/100 (0.001 x 100) x 1/100 = 0:1/100 = 0.1%