initial commit / add all books

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diff --git a/1208/CH2/EX2.4/Exa4.sce b/1208/CH2/EX2.4/Exa4.sce
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+//Exa4

+clc;

+clear;

+close;

+//given data is :

+n=3;// in years 

+disp("Let P=x then A=2*x");

+disp("Let r% be the rate of interest");

+//formula : A=P(1+r/100)^n;

+//putting values

+disp("2*x=x(1+r/100)^3");

+disp("or");

+disp("2=(1+r/100)^3")

+//on solving this eqn

+r=((2^(1/3))-1)*100;//in %

+disp(r,"rate is comtuted :")

+disp("suppose in n years the amount x will become 16*x, then by formula")

+//16=(1+r/100)^n;

+n=log(16)/log(1+r/100);

+disp("Time is : "+string(n)+" years");
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