How do you solve A=P+Prt for r ?
Separate the r term from other terms in the expression:
Given expression is A=P+Prt
Write r in other terms A, P and t.
P+Prt=A
Subtract both sides by P.
∴P+Prt-P=A-P⇒Prt=A-P
Divide both sides by P and t to separate the term r.
∴PrtPt=A-P(Pt)⇒r=A-P(Pt)
Hence, the value of r is A-P(Pt).
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