# Maths helpWatch

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Thread starter 2 years ago
#1
Compound interest formula how do you rearrange it to find n (time)
0
2 years ago
#2
A = P (1 + r/n) (nt)

n = ln(FV / PV)ln(1 + r)

https://www.mathsisfun.com/money/com...erivation.html
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Thread starter 2 years ago
#3
what in
0
2 years ago
#4
U havent learnt logarithms yet???
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Thread starter 2 years ago
#5
not in GCSE is there any other ways
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2 years ago
#6
not sure if this is what you're asking but there's something like this to find how many years it takes for money to double

8% compound interest:
(m = original amount, n = number of years)
m x 1.08^n = 2m (divide by m)
1.08^n = 2

then use trial and error
2 is between 1.08^9 and 1.08^10
so m doubles after 10 years
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Thread starter 2 years ago
#7
so this is the question
Jake invested £1200 for n years in a savings account
He was paid 2.5% per annum compound interest
At the end of the n years he told his sister he had 1360 in the savings account
Work out the value of n?
Do you use Trial and error or Log (A-level)
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