Question Washi (Septemeber 2018)

Hello Sir In the answer of this question APPENDICES, part of "receipt invested " It is used spot cross rates could you please explain how we calculate this ? furthermore after calculating of spot cross rate of ARD/ JPY 1 0.70-.074 ,It is used lower rate (0.70) for selling the first currecy ( cash of project in ARD to change it to JPY) . This is contrary to the normal rule while selling first currency we must use (higher rate or the rate we receive less of JPY )of 0.74 . Any justification for this ? Thank you Regards R.Sami