Answer:
The decimal part of 40 is 0.40. 102 is not a decimal part of 40, so the answer is 0.
To explain further, a decimal part of a number is a fractional part of the number expressed as a decimal. For example, the decimal part of 40 is 0.40, which is the same as 40/100 or 4/10. 102 is not a fractional part of 40, so it cannot be expressed as a decimal part of 40.