A=1085.16 T=3 r=.06 monthly, so n=12 this will give you the starting amount. (A-P)/12 will give monthly interest. 1085.16=P(0)e^.06(12*3) 1085.16=P(0)e^.06(36) P(0)=1085.16/(e^2.16) P(0)=$126.16 Solution A=1085.16 T=3 r=.06 monthly, so n=12 this will give you the starting amount. (A-P)/12 will give monthly interest. 1085.16=P(0)e^.06(12*3) 1085.16=P(0)e^.06(36) P(0)=1085.16/(e^2.16) P(0)=$126.16.