Calculate the acid$-$test ratio, assuming that cash $+$ accounts receivable $=$ $$50,000,$ merchandise inventory $=$ $$10,000,$ noncurrent assets $=$ $$40,000,$ current liabilities $=$ $$20,000,$ noncurrent liabilities $=$ $$50,000,$ and stockholders' equity $=$ $$30,000.($Round your answer to one decimal place, if necessary.$)$