Increasing Duration - CFAI Reading 22, EOC question 2

So the exact answer is 119.69. CFAI says that we need to buy 119 contracts to increase to the desired duration … I’m really tired tonight, but I’m pretty sure that rounding 119.69 means we should be buying 120 contracts. But I checked the errata, and nothing. What am I missing here?

CFA Institute sometimes rounds funny.

Buy 120. And give it not another thought.