A tank of 100 litres is filled with kerosene. Ram replaces 10% of kerosene with water and repeats this procedure 4 times. What is the amount of kerosene left in the tank? 
							Options
 - 60 litres
 - 65.61 litres
 - 70 litres
 - 65 litres
							CORRECT ANSWER :   65.61 litres 
                            
                            
			        
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