Which of the following is a fraction equal to 0.0075?

Concept: To convert a decimal into a fraction, write the decimal digits as the numerator over a power of 10 equal to the number of digits after the decimal point, then simplify by dividing numerator and denominator by their greatest common divisor (GCD).

Application:

1. 0.0075 has 4 digits after the decimal point, so it can be written as 75/10000.

2. The GCD of 75 and 10000 is 25.

3. Dividing both the numerator and denominator by 25 gives 3/400.

Cross-check: Dividing 3 by 400 gives exactly 0.0075, confirming that 3/400 is the correct fraction.