Calculation Questions: for business

$48.$ If assets are $$380,000$ and liabilities are $$150,000,$ what is owner$$s equity?

$($Show the formula & your work$)$:

$49.$ If assets are $$400,000$ and owner$$s equity is $$280,000,$ then what are liabilities? $($Show the formula & your work$)$:

$50.$ If revenue is $$370,000$ and expenses are $$306,800,$ then what is net income? $($Show the formula & your work$)$:

Bonus: Why is it so important for investors that a company provides timely and accurate financial reports to its stakeholders $?$