Firm’s market to book value ratio can be calculated by dividing the market value of the firm’s equity by the book value of the fir’s equity.
Market value of the firm’s equity = market value of current assets + market value of book value – market value of firm’s debt
= $10 million + $90 million – 50 million
= $50 million
Book value of firm’s equity = Book value of current assets + book value of fixed assets – book value of liabilities
= $10 million + $60 million – 40 million
= $30 million
Market to book value ratio = $50 million/ 30 million
= 1.67 times