Which country's wheat price should one consider when paying fidyah?

Q: My question is regarding the fidya for salah of my grandfather that passed away (May Allah forgive his sins and bless his soul). Our family (including aunts and uncles in Pakistan, USA and UK) decided to pay the fidya for his 29 years worth of salaahs that he didn't pray but the problem we are having is about the calculation of wheat as which country's wheat price should we consider. He got matured (the time when salah becomes farz) in Pakistan, lived in Africa for 10 years and also passed away there but his body was brought to Pakistan for burial.

1. Which country's wheat price should we consider? Paksitan, USA (my family resides here) or Africa?

2. After considering the wheat price, how can we divide the payment of the fidya in all the family members? If the wheat price of America or UK is considered then the aunts in Pakistan will not be able to pay as it is too much after the conversion amount in rupees.

Nabi (sallallahu alaihi wasallam's) first meeting with Jibreel (alaihis salaam)

Q: I have a strange question. When the first Quranic verse was revealed, why Nabi (sallallahu alaihi wasallam) did not recognize Jibreel (alaihis salaam) the angel but Khadija (radhiyallahu anha), the first wife of Nabi (sallallahu alaihi wasallam) recognized the angel and what made her open her hair, she had never met and seen the Angel Jibreel. Could you please clear this thing?