Class 2 nic

In real life it is on a weekly basis from when the trader started to trade or until they ceased trading. I would expect an exam question to test a full year of trading but if a start up or cessation situation I would time apportion on a monthly basis so for example a 3 month period would be 3/12 x 52 weeks = 13 weeks. I think it very unlikely that a fraction that didn’t work to a nice round number of weeks would be examined, 4/12 (as in your example would be just over 17 weeks) – if this were tested then on a MCQ the options would include either 17 or 18 weeks not both thus making it a straightforward decision – the examiners have got more important things to test!!