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diff --git a/1682/CH6/EX6.6/Exa6_6.sce b/1682/CH6/EX6.6/Exa6_6.sce
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+//Exa 6.6
+clc;
+clear;
+close;
+//Alternative 1 : Purchase of diesel Taxi
+disp("Alternative 1 : Purchase of diesel Taxi");
+VC=390000;//in Rs
+LpY=60000/30;//in litres
+FcY=2000*8;//in Rs
+AllExp=FcY+9000+15000;//in Rs
+S=60000;//in Rs
+i=20;//in % per annum
+n=4;//in years
+//Formula : (A/F,i,n) : (i/100)/(((1+i/100)^n)-1)
+//Formula : (A/P,i,n) : ((i/100)*(1+i/100)^n)/(((1+i/100)^n)-1)
+AE1=VC*((i/100)*(1+i/100)^n)/(((1+i/100)^n)-1)+AllExp-S*(i/100)/(((1+i/100)^n)-1);//in RS
+disp(AE1,"The Annual equivalent cost for this alternative in RS. : ");
+
+//Alternative 2 : Purchase of petrol Taxi
+disp("Alternative 2 : Purchase of petrol Taxi");
+VC=360000;//in Rs
+LpY=60000/20;//in litres
+FcY=3000*20;//in Rs
+AllExp=FcY+6000+15000;//in Rs
+S=90000;//in Rs
+i=20;//in % per annum
+n=3;//in years
+//Formula : (A/F,i,n) : (i/100)/(((1+i/100)^n)-1)
+//Formula : (A/P,i,n) : ((i/100)*(1+i/100)^n)/(((1+i/100)^n)-1)
+AE2=VC*((i/100)*(1+i/100)^n)/(((1+i/100)^n)-1)+AllExp-S*(i/100)/(((1+i/100)^n)-1);//in RS
+disp(AE2,"The Annual equivalent cost for this alternative in RS. : ");
+disp("The annual equivalent cost of purchase and operation of cars with diesel engine is less than that of cars with petrol engine. Therefore, the taxy company should buy cars with diesel engine.");
+//Note : Calculation in the book is not accurate.
+\ No newline at end of file