Lending one''s name to a company

Q 1: We are several brothers and we have a company which has been established for many years now. When I was an undergraduate, I did not work in the company and did not know anything about the transactions my brothers made. A few months ago, after graduation I started to work with them. However, I had some doubts about the company's transactions; I do not know if they are lawful or not. The transactions are as following: 1- Our company which I will refer to as (A) had a partnership with another company. They both opened a mega market where music cassette tapes, beer and tobacco are sold. They do not sell many of these items so they do not affect the profits so much. 2- Our company (A) entered in a partnership with other companies and (Part No. 14; Page No. 294) formed another company (B). Our Company (A) owns 16% of the shares of the new company (B). Company (B) established a new factory with a large capital and had to take loans from the bank with interest. 3- Our company (A) had a partnership with some other people who established another factory. After defining the capital to be invested in this factory, the partners agreed that our company (A) would finance this project in return for specific interest. 4- Our company has run up an overdraft in many transactions. This means that when our company draws all its bank deposits, the bank allows it to draw from the bank's money in return for specific interest. 5- Our company purchases and sells shares. These shares include bank shares and shares of some Saudi stock companies which involve usurious transactions and purchases shares, bank shares and shares of other companies outside Saudi Arabia which it buys and sells. 6- We also have a store for electric equipment which sells videos, TVs, cassette recorders, fridges and other goods. (Part No. 14; Page No. 295) 7- We have a restaurant where water pipes and cigarettes are served. 8- We have a partnership in an amusement park which yields a great deal of profit. The profit of all such transactions are mixed with the profit of our original company. Is our company and its profit unlawful?