Answer:
r = A - p
pn
Step-by-step explanation:
A = P(1 + nr)
A = P+ Pnr
pnr = A - p
r = (An−nP)/P
Divide P on both sides.
A/P = 1 + nr
Subtract 1 on both sides.
A/P - 1 = nr
Divide n on both sides.
A/P/n - 1/n = r
(An−nP)/P = r
