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| Thread ID: 112882 | 2010-09-25 21:14:00 | Net of GST | Bryan (147) | PC World Chat |
| Post ID | Timestamp | Content | User | ||
| 1139609 | 2010-09-26 01:08:00 | ...don't ask me why... The reason is because in the first instance, you're adding 15% of 100 (i.e. 15), and in the second instance you're subtracting 15% of 115 (i.e. 17.25). As 15% of 115 isn't the same thing as 15% of 100, that's what causes the incorrect answer. This is the same thing that Snorkbox was pointing out before. |
Erayd (23) | ||
| 1139610 | 2010-09-26 01:15:00 | As 15% of 115 isn't the same thing as 15% of 100, that's what causes the incorrect answer. Don't you mean, correct answer? (your example is correct - that 15% of 100 is not the same as 15% 0f 115) |
WalOne (4202) | ||
| 1139611 | 2010-09-26 01:15:00 | I was just pointing out that pctek was wrong :2cents: Ken |
kenj (9738) | ||
| 1139612 | 2010-09-26 01:17:00 | Don't you mean, correct answer? (your example is correct - that 15% of 100 is not the same as 15% 0f 115)Touche... mathematically correct, but incorrect as a GST calculation. | Erayd (23) | ||
| 1139613 | 2010-09-26 01:40:00 | 7.66666666 You need 8 6's to get the required precision. I found it to be 7.66666666666 which is 11 6's. That takes it to a decimal precision of 10. For most occasions 8 would be enough but over time those extra three would make a difference. My reason for knowing that figure is so that I don't have to change a program I wrote ages ago as a calculator with specific GST that would stay on top of all other windows. My brother finds it very useful. |
mikebartnz (21) | ||
| 1139614 | 2010-09-26 03:18:00 | Oh boy! What does this say about the standard of math education in NZ!! Nothing wrong with my math education but it's a case of if you don't use it you lose it. :rolleyes: After reading all this it seems to me that the IRD method is the easiest after all. |
FoxyMX (5) | ||
| 1139615 | 2010-09-26 08:49:00 | The reason is because in the first instance, you're adding 15% of 100 (i.e. 15), and in the second instance you're subtracting 15% of 115 (i.e. 17.25). As 15% of 115 isn't the same thing as 15% of 100, that's what causes the incorrect answer. This is the same thing that Snorkbox was pointing out before. Thanks for that, I have never been good with maths. When I went to school, it wasn't considered important for girls to learn it much. :blush: LL |
lakewoodlady (103) | ||
| 1139616 | 2010-09-26 09:41:00 | Should we just round it up and make GST 20% :p | pine-o-cleen (2955) | ||
| 1139617 | 2010-09-26 11:00:00 | Should we just round it up and make GST 20% :p Or down to 10%! |
beeswax34 (63) | ||
| 1139618 | 2010-09-26 20:46:00 | Just use Xero, it takes care of it all, and always quote +GST ;) | Chilling_Silence (9) | ||
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