Valid & Invalid transactions

Q: My friend is planning to buy a petrol station. However, he requires R3 million and he only has R2 million with him. He asked me to help him by giving him R1 million so that the petrol station can be registered under his ownership. Thereafter, we will follow the conditions below:

Condition 1: He will give me full access to run the business for 3 years and all expenses and profits will accrue to me. He will have no share or involvement in the business for 3 years.

Condition 2: I have to give him a monthly rent (as per the current market in that location) for running the business on his property.

Condition 3: After 3 years, he will return the R1 million which I had given to him at the beginning. He says that this money will be considered as a security deposit and any damage or loss occurred during these 3 years will be deducted from it. Is this deal halaal or haraam?

Q: Would it be permissible to sell a good on credit for a price higher then the normal cash price? The customer buying on credit will pay in equal installments based on the price agreed upon at the outset of the transaction. 

Q: We chose a cow for qurbaani. The seller is charging other customers R38 per kg. When he sent the bill to us, it was R41.50 per kg. My husband queried it and the seller responded that he has his own system of working out the cost which he does not have to explain, and we can cancel the purchase if it is not suitable to us. Is it permissible for him to conduct business in this way?

Q: Is bidding halaal in Islam?

Q: What do you think about binary options eg like expert option or iq option. Are they halal or haram? 

Q: My question is,"I am a young person doing my job. I suffered from crises of income. My company's policy has been changed that each worker should have a smart phone to do whatsapp of any competeter activity in the market. While I don't have that phone and I don't have the payment power to purchase that cell phone on cash. So, I decided to purchase that on installment but some persons are making me tense that it is interest.(Sood). Please guide me is it sood?

Q: My Question is as follows. I want to start selling items on a website called etsy.com. It is a website were people can sell handmade items. The way it will work is that the website charges you a small fixed fee to list the item and then they take 3.5percent of the sale price once the item is sold. Also people can pay through paypal and they can pay with a credit card which means it they will be buying on account which will then be an interest transaction for them. Alot of people sell other items, some of which is haraam and alot of other stuff has to with other religions. It is permissible to sell through this website and would it be a wholesome way to earn a living or will it be better to find other avenues to sell goods?

Q: Can I buy any business property where the main business holder (who wants to sell his business now) took bank loan for his business?

Q: I earn money through marketing and selling health products online. Is this allowed in Islam?

Q: I'd like to buy and sell items which will be imported. I won't be importing bulk but rather will advertise an item and buy it once I have an order for that particular item. I will be charged about R285 to import. So if I buy an item that costs e.g. R300 my total will be R300+R285=R585. And i'll add a profit to it. e.g.R50 which will make the item R635. I'd like to know if this is permissible Islamically? And if I have 2 orders, each will pay R635 but since the order will go in at the same time I'll end up with more than R50 profit.