Don't round until end please

Your agents are complaining about customer retention again. You survey 603 customers and find that 388 plan to renew with you. What is the upper bound for the 98% confidence interval for the proportion of customers that plan to renew? Please round your answer to 2 decimal places. Please use the following z-scores: . z-score for a 99% Cl = 2.58 . z-score for a 98% CI = 2.33 . z-score for a 95% Cl = 1.96 . z-score for a 90% Cl = 1.64