please answer all three bullet points in full. all three are part of the same question. thank you

4. Construct balance sheets for the following scenarios, then calculate both the return on investment and return on equity. - You start a business with $1,000 of your own money and borrow $19,000 from the bank. You buy a number of shares in a company for $20,000 and after a few good quarters, the price of the shares gain in value to $25,000. - At year end 2007, an investment bank held around $90 billion in MBS and $210 billion in other assets. The firm had equity of around $25 billion and financed the rest of its operations with $275 billion in debt. By mid 2008, the value of its MBS portfolio fell to $40 billion. - In 2011, a worker at a tech startup in San Francisco bought a modest apartmeny for $1 million dollars with a mortgage where they put 35% of their own money down. Today that apartment is worth $1.7 million