Given that,
90.125
Now, we have
9 at tens position, that is 9 x 10
0 at one's position, that is 0 x 1
1 at the tenth position, that is 1 x 1/10
2 at the hundredth position, that is 1 x 1/100
5 is at the thousandth position, that is 1 x 1/100
Now, if we sum all, we get
(9 x 10) + (0 x 1) + (1 x 1/10) + (1 x 1/100) + (1 x 1/1000)
The second term (0 x 1) = 0. Hence,
9 x 10 + 1 x 1/10 + 1 x 1/100 + 1 x 1/1000
Hence, the options C is correct.