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Having problems thinking of what the formula is for calculating the following:-
Say you you have the following:-
Gross income 2005= £8000
If this is a rise of 30% of the previous year then how would you calculate what the previous years gross was?
Same applies if it was 35% , 45% etc.
Thanks
Busby
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A rise of 30% is another way of saying it was 1.3 times larger (ie 1 + 30/100).
So the previous year was 8000/1.3 = 6153.84.
(6153.84 plus 30% = 6153.84 + 30% of 6153.84 = 6153.84 + 6153.84×0.3 = 6153.84 + 1846.15 = 7999.99)
"The physicists defer only to mathematicians, and the mathematicians defer only to God ..." - Leon M. Lederman
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If something goes down by 44% then it is 1 - 44% of 1 or 1 - .44 x 1 or 1 - .44 or
0.56 of what you started with.
If something starts at 56 and ends at 100, then it is a 44% decrease going BACKWARDS in time, which is NOT 44% increase. Figure out that you are adding 44 to 56, but what part of 56
is 44. Well it is a fraction called 44 56ths of 56. (Like 2/3's of 3 is 2)
(or like 1/2 of 2 is 1) ( or like 44/56 of 56 is 44) ( or like 33333/888 of 888 is 33333)
It takes some getting used to.
Hope that doesn't just make it confusing.
igloo myrtilles fourmis
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