How would you would out Yield to Maturity is you have all the necessary information- $1000 par, 6 years remaining maturity, 5.7% annual coupon payment, but the holder of the bond is currently using their power to convert it into 25 shares of a company. each share is worth $18.18.

I know it would be less than a non-convertible bond, but is it possible to work out from those numbers?