Question

what is the formula for principal... in simple interest?

Answer 1

$<b>DEAR STUDENT$

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To find Principal when Time Interest and Rate are given the rules are.

Interest = (Principal × Rate × Time)/100

Principal = (100 × Interest)/(Rate × Time)

For example:

1. Find Principal when Time = 3 years, Interest = $ 600; Rate = 4% p.a.

Solution:

Time = 3 years,

Interest = $ 600,

Rate = 4% p.a.

Principal = (100 × Interest)/(Rate × Time)

= (100 × 600)/(4 × 3)

= 60000/12

= 5000

Therefore, Principal (P) = $ 5000.
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•̀.̫•́✧Hope it's help you !•̀.̫•́✧

Answer 2

P=I /Rate⋅Time

where,  

P means Principal

I means Interest

Also, the future amount is the sum of the principal and the interest. Therefore, the principal is just the difference between the future amount and the interest.

P = Future Amount - Interest

If only the future amount, time and interest rate are given, we can use the following formula to calculate the principall.

P=Future Amount/ 1+(Rate⋅Time)