Discharging fidyah

Q: 

1. With regards to paying fidyah for the deceased person's missed salaahs, what is the minimum amount in the form of wheat? 

2. An alternative to discharging the fidyah in the form of wheat or money is to feed one poor person 2 meals to their full for each salaah. Does it have to be the same poor person that is given two meals or can it be 2 poor persons given one meal each? Also, can one person be fed multiple times or given more than the stipulated amount of wheat? (E.g. Giving him 6 meals or a 10kg bag of wheat)? 

3. How would fidyah be calculated if given in the form of rice or maize? 

4. Are their any criteria for the recipients of the fidyah? Do they have to be Muslim and can children be fed as well or do they have to be adults? 

5. As these calculations come to quite exhorbitant amounts, is it permissible to discharge the fidya in a country where the price of food is cheaper such as India, and does mufti know of anyone in India who can assist us in having this done?

Charging handling fees on items returned

Q: Is it Islamically permissible to:

1. To charge a general 15% handling fee for all returns for admin & transportation costs. Example, the seller is in Durban and the buyer is in Johannesburg or Cape Town. The seller incurred admin & transport costs to get the goods delivered & will incur costs to get the goods returned. There could be various reasons for the returns - incorrect goods supplied, excess stock bought, damaged goods received, buyer cannot sell the goods etc. 

2. If there is a price dispute between the seller & the buyer for goods supplied, can the seller write off the disputed amount as a donation? 

Note: The sales rep quoted the buyer a price and the admin office charged a higher price. When the buyer received the invoice, he queried the price & refused to make payment until he is charged the quoted price.