HELP! I need a professional tutor to HELP me solve these 8 problems I have a TEST coming up and I have NO CLUE how to do these. I have the answers on the bottom but that will do me no good for the exam.

I NEED DETAILS IN EACH PROBLEM on HOW YOU GOT THE ANSWER.

because I have no idea how to calculate these problems so provide me with step by step and be VERY CLEAR. !

Problems 1) If the initial margin is 50%, and you are buying 200 shares at $30/share, how much money do you have to have to provide? 2) If the price decreases to $20, what is the margin now? 3) If you sell at a price of $20 one year from now and the margin interest rate was 10%, what was your rate of return? 4] The maintenance margin is 15%. At what price would you have a margin call? 5) If the initial margin is 50%, and you are selling 200 shares short at $30/share, how much money do you have to provide and how much is in your account? 6) If the price decreases to $20, what is the margin now?| 7) If you close your account one year from now, buying at a price of $20 (assume that margin interest rate was 10% on the initial value of shares borrowed, no interest was earned on cash in your account and a $1/share dividend was paid), what was your rate of return? B) The maintenance margin is 15%. At what price would you have a margin call ( before interest and dividends)? Answers 1) $3,000 2 25%% 3) -76.7% 4) 17.65 6) $3,000, 59,000 6) 125% 7) 40% 8) $39.13