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As price of the chip declines by 67%, the new price of the chip after 6 months is 33% of the original price. So price of chip after 6 months = 81/3 Price of chip after n number of 6 months = 81/(3^n) given 1 = 81/(3^n) 81 = 3^n n = 4 So number of years = 4*6/12 = 2 Answer is B