Individual wealth management

CFAI 2014 exam Q 1 C:

I calculated IRR on the semi annual basis. My answer is different than annual. Is that wrong?

Thanks

They usually do it annually.

Hi magician,

I knew you will come to my rescue. Thanks.

Calculating on semi-annual basis should be close enough right? Does it have to be perfect?

I did calculate on semi-annual basis on the exam- was that wrong?

Thanks,