Which one of the following is correct ?

This is the tallest tree I have never seen

This tall tree I have never seen

This is the tallest tree I have ever seen

This tall tree I have ever seen

This is the tallest tree I have not yet seen

Description (বিবরণ) :

প্রশ্ন: Which one of the following is correct ?

ব্যাখ্যা: 

Suppose cost price  =  100 Tk.
Gain on 25Tk  =  2.50 Tk  =  Selling price  =  25   +  2.50  =  27.50 TK 
Loss on 75 Tk  =  15 Tk Selling price  =  75  -  15  =  60 Tk 
Total selling price  =  60   +   27.50  =  87.50 
Loss  =  100  -  87.50  =  12.50

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