# How Do You Find The Principle When Rate And Time And Amount Of Interest Is Known?

By the rate and time....
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You can use a simple interest formula for finding the principle amount. It is as follows:
P= I/rt
where
p is the principal amount
I is the interest amount
r is the rate of interest
T is the time for investment
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Richard Enison commented
I gave your answer five stars because it is basically correct. I didn't deduct for spelling, like the fact that you used upper and lower case P for principal, and T for time, and that you spelled principal correctly in one place, and incorrectly (as the questioner did) in another.
P=?, T=5years, R=5%, A=5550
Please solve it & also advice me how you can solve it By taking these formulas
I=p*r*t & A=P+I
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P=?, T=5years, R=5%, A=5550
Please solve it & also advice me how you can solve it By taking these formulas
I=p*r*t & A=P+I
thanked the writer.
I x r x t  ex: I = 680\$ p = ?  R = 2%  t = 4 years   680 x .02 x 4 = 896 and 896 is your answer! Hope I helped!
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A = P(1+rt) if the interest is not compounded.
A = total amount; P = principal amount; r = interest rate for a period; t = number of periods

P = A/(1+rt)    (divide both sides by (1+rt))

Example
An amount of \$1200 is the balance after 2 years at an interest rate of 10%.

P = \$1200/(1+.10*2) = \$1200/(1.20) = \$1000
_____
If the interest is compounded n times per period,

P = A/(1+r/n)nt
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