I have finished a paper but need help check my work. the last portion asks to predict the exchange rate from one year from now what is the best way

I have finished a paper but need help check my work.

the last portion asks to predict the exchange rate from one year from now

what is the best way to calculate the foreign exchange rate?

can you please calculate the 2018 exchange rate for Japan and show work to predict the exchange rate for 1 year from now?