The problem
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where does the 1 come from in this equation.
Answer provided by our tutors
You start with the equation:
A = P + Prt
Nothing will change if we switch the sides:
P + Prt = A
Then, we pull 'P' in front of brackets on the left hand side:
P(P/P + (PRt)/P) = A
P(1 + Rt) = A