XYZ Corporation has zero$-$coupon debt outstanding which has a face value of $$600,$ due in five years. The market value of the firm's assets now doubles the face value of debt. The annualized standard deviation in firm values of comparable firms is $10\%$ on a annual basis. The five$-$year T$-$bond rate is $5\%.$ Estimate the value of equity, using an option pricing model $($keep two decimal places$).$