You are the founder of Bide and Co, a young start up company. You put in $200,000 of your money and received 2 million shares. Your company has since been through three additional rounds of financing:  1,000,000 shares issued at $2 per share in Series A; 500,000 shares issued at $3 in Series B and another 600,000 shares at $4 each in Series C

What is the pre-money valuation for the Series B funding round?