Club Car is an American company that manufactures electric and gas$-$powered golf cars and UTVs for personal and commercial use. At the

beginning of $2021,$ Club Car had assets of $$540,000$ and liabilities of $$320,000.$ During $2021,$ assets increased $$50,000$ and liabilities

increased $$10,000.$ What was stockholders' equity at December $31,2021?$

$*$Fill in the correct answer with or without commas, with or without dollar signs.