Make t subject of formula.S=P(1+Rt)
Make t subject of formula. S=P(1+Rt)S=P1+RtPS=P+PRtS-P=PRtt=(S-P)/PR
\(S=P(1+Rt)\\ 1+Rt=\dfrac{S}{P}\\ Rt=\dfrac{S}{P}-1\\ t=\dfrac{\dfrac{S}{P}-1}{R}\)