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#1 2007-06-12 03:34:42

Pete
Guest

percentage

Hi,
I'm trying to work something out for work and i'm afraid its 20 years since i did percentages and I just can't remember. Help would be appreciated.

If a printer cartridge has a life of 9000 pages at 5% coverage per sheet but the coverage is 8% what would the lifespan in pages be at 8%, I've got it as 7200 but I'm not entirely sure how i've done it or whether its right wink

Any help would be appreciated

Cheers
Pete

#2 2007-06-12 03:54:20

mathsyperson
Moderator
Registered: 2005-06-22
Posts: 4,900

Re: percentage

If a printer cartridge can cover 5% of 9000 sheets, then that's equivalent to it being able to fully cover (9000x5÷100 = ) 450 sheets.

Then, working backwards, if a cartridge can fully cover 450 sheets then it can cover 8% of (450÷8x100 = ) 5625 sheets.

A more direct way would be to just do 9000 x5 ÷8.


Why did the vector cross the road?
It wanted to be normal.

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#3 2007-06-12 04:15:01

pete
Guest

Re: percentage

thankyou kind sir, very much appreciated smile

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