According to the answer, the formula used is indirect quotes [(Forward - Spot) / Spot * 360/day *100 =?%], but why it cannot be direct quotes [(Spot - Forward) / Forward *360/days * 100 = %] in this question?

Can you tell me in which case I need to use indirect or direct quotes?

Q1. Compute the forward discount or premium for the Mexican peso whose 90 -day forward rate is $.102 and spot rate is $.10. State whether your answer is a discount or premium