Equivalent Fractions · Superchallenge problem

The fraction $\dfrac{13}{52}$ is equivalent to $\dfrac{1}{4}$, its numerator and denominator are both two-digit numbers, and it uses four different digits (1, 3, 5 and 2). How many fractions equivalent to $\dfrac{1}{4}$ have a two-digit numerator, a two-digit denominator, and four different digits? Count $\dfrac{13}{52}$ too.