So if we know the probability distribution functionality formula 35 , we can find the function formula 36 and calculate the optimal reservation price from it . So , if we know the probability distribution functions formula 35 , we can find the function formula 36 , and from it , calculate the optimal reservation price . So , if we know the probability distribution functions formula _ 35 , we can calculate the function formula _ 36 , and from it , find the optimal reservation price .