Which of the following is the mathematical formula for calculating forward premium?

Forward premium Forward rate$-$Spot rate$)/$ Forward rate$](\frac{n}{360})100$

Forward premium $($Forward rate$-$Spot rate$)/$ Forward rate$](\frac{360}{n})100$

Forward premium $($Forward rate $-$ Spot rate$)/$ Spot rate$](\frac{360}{n})100$

Forward premium Spot rate Forward rate$)/$ Forward rate$](\frac{360}{n})100$