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If you have the owner's manual, it should say in there. In lieu of that, you can easily take off the top portion of the timing belt cover, if it doesn't come off (water pump pulley may prevent it from coming off) you can pull it away enough to see which kind of teeth it has.
50k mile interval = square tooth
100k mile interval = rounded tooth
I'm going out on a limb here but I don't think the 240 series cars ever came with a 100k/round tooth belt. My '94 945 Turbo has the 100k interval, but I believe (according to my Maintenance Schedule book) the normally aspirated 940 cars came with a 50k interval.
Good luck,
Bean
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'80 242GT 92k, '94 945T 123k
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