Factors that make Zakaat compulsory

Q:

1. Is Zakat due on the current market value of the land or the original value at which it was bought given that the land is still in my possesion? Also the intention of buying this land is to build a house for personal use.
2. In order to avoid Riba (interest) to buy a house without mortgage, I am intending to buy land(s) such that after few years I will buy a house for my own personal use after selling 1 or more lands. Is Zakat still due on this land(s)? If yes then on principal amount or current market value?

Q: If a person bought a car but hasnt paid in full. Eg. the car costs R100 000 and monthly he is paying R2000 towards the car. His total cash is R50 000. Is the R100 000 a debt on him? Does he still have to pay Zakaat?

Q: I have a few graded Mandela R5 coins (year 2000 and 2008) that I have acquired. They are legal tender, but because of their demand and rarity, I bought them for a few thousand rands. I purchased them with an investment intention. How do I pay zakaat on them?  The coins have no gold or silver in them.

Q: A brother owns an apple orchard, which consists of 500 trees. How would he calculate his zakaat? (He is of the shaafee maslak)

Q: A person grows crops. Every week or 2nd week, he harvests his crops. When should he pay zakaat and what amount?

Q: A landlord has asked for a deposit to rent out his property. Who would be liable for the zakaah on the amount annually?

Q: Is Zakaat acceptable from one who engages in the business of selling alcohol? Can he give sadaqah from his wealth?

Q:

1. If we have bought land at a cost of 10lakhs & we kept that land for a period of 6 years & then we sold at 26.5 lakhs. Do we have to give zakaat on that 6 years? Do we have to give zakat on the profit we got  from it? How much do we have to give 2.5%, less or more?
2. If I have a property and no income is coming from that property then do I have to give zakaat on cost of that property?
3. I have a house in which i am not living, but i rented that house. Do I have to give zakaat on the rent I am getting from that house?
4. We have to give zakaat on gold no doubt. On what rate do we have to give zakaat? On the present rate or on the rate at which we bought it?

Q: I have taken a flat on instalment for 1,850,000 Indian Rs. I have given 500,000Rs out as initial payment. I still have to pay the remaining amount. I have 1,000,000Rs  in hand now which i have to give. Do I need to pay zakaat on it?