On the base of given question, can you help to understand how the solution was d

The first derivative product is an over-the-counter forward rate determined on the basis of the Zuhait base rate of 8·5%
plus 25 basis points and the French base rate of 2·2% less 30 basis points.
Alternatively, with the second derivative product Lignum Co can purchase either Euro call or put options from Medes
Bank at an exercise price equivalent to the current spot exchange rate of ZP142 per €1. The option premiums offered
are: ZP7 per €1 for the call option or ZP5 per €1 for the put option.
The premium cost is payable in full at the commencement of the option contract. Lignum Co can borrow money at
the base rate plus 150 basis points and invest money at the base rate minus 100 basis points in France.

Answer:
Forward rate = 142 x (1 + (0·085 + 0·0025)/3)/(1 + (0·022 – 0·0030)/3) = 145·23
>>> Why it has been divided by 3? Please help to understand.