So I'm given that the barometer reads 738.5 torr, and :delta: = 2.35 cm, SO, I know what an open-end barometer's pressure is P_{gas} = P_{atm} - :delta: h when P_{gas} < P_{atm}

What is the pressure in atms?

I do:

738.5 - 2.35 cm = 736.15 torrs x (1 atm /760 torr) which gives me .9686 atm

But the book says .9408 atm!

What am I doing (trivially) wrong?!