# pev december 08 2.2

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Registered Posts: 56 Regular contributor ⭐
Just a quick one chaps, i know it's late.

On part (a) of this question can anyone explain where the answer comes from, and that figure of 0.90?

Thanks

• Registered Posts: 57 Regular contributor ⭐
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Want 9000 of "good" production. 10% gets wasted for that to happen ? How much do you make to allow 10% to get wasted and give you 9000 of "good" production ?

9000 = g -10% of g = g - 10/100 x g = g-0.1g = 0.9g

so g = 9000/0.9 = 10000 of gross production.
• Registered Posts: 275 Dedicated contributor 🦉
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Hi,

Wow, Jay that looks complicated! :huh:

I would just have said that if 10% gets wasted then you have 90% of 'good' stock.

I would work it out as 9000/90 x 100= 10000 units are needed to make the 9000.

But then I am a girl and like things to be REALLY simple
• Registered Posts: 275 Dedicated contributor 🦉
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LOL, I have just read the question properly now.

Ignore me i think that all this revision and the thought of doing four exams next week is all a bit too much.

Jay was right, and he actually read the question properly before posting a reply....I shall now go back to my books.:huh:
• Registered Posts: 56 Regular contributor ⭐
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Thanks, I seriously hope that doesn't come up on the exam
• Registered Posts: 57 Regular contributor ⭐
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Have a look in the recent Jun 2009 AAT magazine issue on page 28. There's a good explanation of percentages in there, and a bit on algebra too.
• Registered Posts: 1,657 Beyond epic contributor 🧙‍♂️
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It's a pretty standard percentage question and the sort of thing you should know how to do at Technician level - similar calculations were required at both Foundation (discounts) and Intermediate (mark-ups and margins).

Although Jay's algebra is perfectly correct, I'm not sure you really need to be quite that formal about things. My thought process would be something like

9000 is 10% less than x therefore 9000 is 90% (ie 0.9) of x.
Hence, x = 9000/.9 (or 9000/90 x 100)= 10000.