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How do I find the variable "P" if the interest rate is 6% the time is 3 years and the simple interest is $2952?
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3 Answers

hi ben
my answer is P=16,400
I took the simple interest- 2952 and divided it by 3 years= 984- so you are getting 984.00 interest per year
then take the 984 you get each year and divide it by your interest rate =0.06 and you get 16,400
to check yourself-- take 16,400 and multiply it by 0.06 and you get 984 (the interest you get each year) and multiply it by 3 years and you get 2952--total interest
You can also do it this way: take the total interest 2952 and divide it by the interest rate 0.06 and you get 49,200, then divide that by 3 years and you get 16,400= principal
Find the variable "P" if the interest rate is 6%, the time is 3 years, and the simple interest is $2952.
simple interest earned = P I T
$2,952 = (P dollars)*(6% / year)*(3 years)
$2,952 = (P dollars)*(18%)
18% = 18 per centum (Latin for hundred) = 18/100 = 0.18
P = $2,952/0.18 = $16,400
So that you can remember how to do this for any problem, recall that I = PRT.
To solve for the other ones there's a pattern:
P = I / (RT)
R = I / (PT)
T = I / (PR)
Notice that each one is the I divided by the other two numbers.  Make sure you do the denominator first.
So for this:
P = 2952 / (.06*3)
P = 2952 / .18
P = 16,400
What you're actually doing is working that original equation backwards.  If you multiply to get there, you divide to go backwards.