How do i calculate the % increase between 2 numbers?

Question

i have: 6;9;12;16;18

from 6 to 18 i have 200% increase,  but when i ad up the encrese between each number it doesn't com eup to 200 .

6 to 9: 50%
9 to 12: 33.33%
12 to 15: 33.33%
15 to 18: 12.5%
total: 129.16% and not 200%

It is driving me mad.

Jun Agruda · Accepted Answer

= 100%([18 - 6]/6)
= 100%(12/6)
= 100%(2)
= 200%

Answer: That's how it is computed above.

With the other numbers:
6 to 9:
= 100%([9 - 6]/6)
= 100%(3/6)
 = 50%

9 to 12:
= 100%([12 - 9]/6)
= 100%(3/6)
= 50%

12 to 16:
= 100%([16 - 12]/6)
= 100%(4/6 or 2/3)
= 66 2/3%

16 to 18:
= 100%([18 - 16]/6)
= 100%(2/6 or 1/3)
= 33 1/3%

Sum of all increase where the base is 6:
= 50% + 50% + 66 2/3% + 33 1/3%
= 200%

That's it! Your basis of increase from 6 to 18 is 6; the basis of computing percentage of increases from number to number must therefore be 6 also, else you're lost in what you want to determine or probe.

James G · Answer

morning Goldfish

the reason its failing is because the 200% is got from the 6

But as you work out the individual parts you are working from the next number each time.

6 to 9 = 50%
9 to 12 = 33%
12 to 15 = 25%
15 to 18 = 20% 

the % are getting smaller describing a curve

so you are doing 2 different sums

mazsheps · Answer

This is just the same as if something has a 50% discount and the stor gives you an extra 10% off you don't get a total of 60% off, you only get 55% off

tv for Â£100
50% off = tv for Â£50
extra 10% off = tv for Â£45

It's just a fact of like because percentages are proportions

How do i calculate the % increase between 2 numbers?

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