P + P r t = A P ( 1 + r t ) = A ∣ d i v i d e b o t h s i d es b y ( 1 + r t ) P = 1 + r t A
A = P + P r t P ( 1 + r t ) = A P = 1 + r t A
To solve for P in the equation A = P + P r t , you can isolate P by factoring and dividing both sides, which leads to the formula P = 1 + r t A . This expresses the principal in terms of the total amount A , interest rate r , and time t .
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