Interest and Gambling

Lending money to an Islamic School on interest

Q: Zaid is willing to lend a Islamic School 50 thousand pounds for a year, on the condition that at the end of the year he gets his full money back, on top of that the School will have to pay him 400 pounds every month,so in total at the end of the year the School will be paying him 54 thousand and 800 pounds,(4 thousand 800 pounds extra) according to Shariah is this permissible,If not permissible could you please explain a Sharee method where the School may borrow money of Zaid and he may also benefit?

Lottery

Q: Is Lottery Permissible? Where Every Month 12 People Put R100 each, and Each Month 1 Person Will Get The Whole Sum Of R1200?

Do we receive interests from conventional banks or dividends

Q: My question is that do we receive interests from conventional banks or is it dividend?  As far as i know, conventional banks use our money to invest and the profit received is shared among clients. Now, the money may have been invested in companies which we do not know if they are "halaal" or not.  But the question remains that is the money received is called dividend or interest?