anonymous
  • anonymous
Find the doubling time of a quantity that is increasing by 9.8% per year.
Mathematics
  • Stacey Warren - Expert brainly.com
Hey! We 've verified this expert answer for you, click below to unlock the details :)
SOLVED
At vero eos et accusamus et iusto odio dignissimos ducimus qui blanditiis praesentium voluptatum deleniti atque corrupti quos dolores et quas molestias excepturi sint occaecati cupiditate non provident, similique sunt in culpa qui officia deserunt mollitia animi, id est laborum et dolorum fuga. Et harum quidem rerum facilis est et expedita distinctio. Nam libero tempore, cum soluta nobis est eligendi optio cumque nihil impedit quo minus id quod maxime placeat facere possimus, omnis voluptas assumenda est, omnis dolor repellendus. Itaque earum rerum hic tenetur a sapiente delectus, ut aut reiciendis voluptatibus maiores alias consequatur aut perferendis doloribus asperiores repellat.
jamiebookeater
  • jamiebookeater
I got my questions answered at brainly.com in under 10 minutes. Go to brainly.com now for free help!
Haseeb96
  • Haseeb96
lets suppose time = x then double time = 2x okay ???
anonymous
  • anonymous
t = log 2/log 1.08 = 9.006468 years
anonymous
  • anonymous
Why log 1.08?

Looking for something else?

Not the answer you are looking for? Search for more explanations.

More answers

welshfella
  • welshfella
yea where did you get that from?
anonymous
  • anonymous
Somebody help, I'm confused :(
anonymous
  • anonymous
i gave you the answer i cant give you the show work to
welshfella
  • welshfella
oops guys I must apologise I had it the wrong way round! you divide the rate into 72 so it is 72 / 9.8 = 7.35 years
anonymous
  • anonymous
That's wrong @welshfella
anonymous
  • anonymous
@kinggg How did you get log 1.08? Where did the number 1.08 come from?
welshfella
  • welshfella
how do you know its wrong?
anonymous
  • anonymous
I entered it and it said answer is NOT CORRECT
anonymous
  • anonymous
@kinggg 9.006468 years is incorrect too
welshfella
  • welshfella
i think the log formula is ln2 / ln(1.098)
welshfella
  • welshfella
that gives 7.41 years
anonymous
  • anonymous
7.41 years is correct!
welshfella
  • welshfella
Lets do it the long way teh suppose the principle is $100 we have double amount 200 = 100(1 + 0.098)^n (1.098)^n = 2 take logs:- n ln 1.098 = ln n = ln 2 / ln1.098) = 7.41
anonymous
  • anonymous
are you doing Exponential growth, doubling time
welshfella
  • welshfella
rounding that up its 8 years
anwaarullah
  • anwaarullah
8 years ,, let 100 be the investment so 100*1.098=,,,,,
welshfella
  • welshfella
yea
welshfella
  • welshfella
i guess that the interest is paid at the end of the year so that would make it 8.
anonymous
  • anonymous
Thanks all!
welshfella
  • welshfella
yw

Looking for something else?

Not the answer you are looking for? Search for more explanations.