Use the expanded accounting equation to answer each of the following questions.

$($a$)$ The liabilities of Platt Company are $$90,000.$ Owner's capital is $$150,000$; drawings are $$40,000$; revenues, $$450,000$; and

expenses, $$340,000.$ What is the amount of Platt Company's total assets?

Total assets $

$($b$)$ The total assets of Sierra Company are $$57,000.$ Owner's capital is $$35,000$; drawings are $$7,000$; revenues, $$52,000$; and

expenses, $$35,000.$ What is the amount of the company's total liabilities?

Total liabilities $

$($c$)$ The total assets of Birch Co$.$ are $$660,000$ and its liabilities are equal to two$-$thirds of its total assets. What is the amount of Birch

Co$.\text{'}$s owner's equity?

Owner's equity $,$$