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+//===========================================================================
+//chapter 10 example 20
+clc;clear all;
+//variable declaration
+V1	= 200;		//voltage in V
+V2	 = 126;		//voltage in V
+t	= 30;		//time in seconds
+V12	= 200;		//voltage in V
+V22	 = 100;		//voltage in V
+
+//calculations
+//let CR = a
+//V2	= V1*e^(t/C*R)
+a       = t/log(V1/V2);		//C*R
+//R1	= (10*R)/(10+R)
+a1       = t/log(V12/V22);		//C*R1
+//a1/a	=R1/R=x
+x	= a1/a;
+//since R1		=  (10*R)/(10+R)
+//x*(10+R)*R = 10*R
+//(x*10)+R*x = 10
+R = (10-(x*10))/x;		//Resistance in Ω
+
+//result
+mprintf("resistance = %3.2f M Ω",R);
+