Valid & Invalid transactions

Selling a car as a loophole to acquire a loan

Q: I have a question regarding interest. I have a financial issue in my business. I need around 5 million to complete my running order. A friend of mine has an electronics business. He is selling his products at a higher price in easy monthly installments. As I told my problem to him, he bought a vehicle for 5 million pkr and sold me this vehicle for 7.5 million in six monthly installments. I sold this vehicle to the same owner at a lower price (4.99 million) and took money for completing my order. Is this haram in Islam? Because my friend is taking money against a product, not against money, and I'm paying him for a vehicle, not for money. If it is haraam, then what is the solution because I already used the money and invested in my business after selling the vehicle. 

Price change in an item that was ordered

Q: A Muslim company confirmed the price of a product with me at R1800. They said stock will come in a few months.

A few months later the product comes and they say I must pay R2200. I said that you confirmed the price at R1800. The company says that price was then, and now it changed because of USD exchange rate. But previously he confirmed R1800 and never mention USD exchange rate.

I waited months to buy it from them and did not inquire elsewhere because they confirmed the price and my order at R1800.

Please advise:

(1) Is their action as above permissible?

(2) If permissible, is it in conformity with Islamic values? I am annoyed because I waited to buy it from them specifically at their confirmed price. I could have bought it elsewhere all these months.

Earning by investing some money by liking and subscribing to different YouTube channels and uploading them to an app

Q: There is an online app in which you get a daily job by investing some money by liking and subscribing to different YouTube channels and uploading them to the app. It gives daily money on account of investment. Like invest 15000 rs and have to do 10 daily tasks and get 600 rs daily. Is it halal?

Earning by viewing adverts online

Q: I am doing online work. The process of this work is that they have websites where we can work. They have the process that first we have to choose the package. I have chosen a package of 1000 rupees. It is a silver package. I have to see ads daily. One ad for one day. 1 ad will give me 60 rupees. This package is valid for 30 days. I will make 1800 rupees from there by watching ads daily on this website. After a month I can withdraw this amount in my easy paisa account. They cut out some service charges and give me 1700 or something. So I wanna know that if this money is halal for me or haram?