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Explanation:

Manufacturers Trade Balance = Manufacturers Imports − Manufacturers Exports 

Manufacturers Imports and Exports for each year are: 

2012: Imports = 35% of 500 = 175 and Exports = 65% of 275 = 178.75 i.e. Trade Balance = Negative

2013: Imports = 40% of 475 = 190 and Exports = 60% of 350 = 210 i.e. Trade Balance = Negative

2014: Imports = 45% of 450 = 202.5 and Exports = 55% of 325 = 178.75 i.e. Trade Balance = Positive

2015: Imports = 50% of 375 = 187.5 and Exports = 70% of 275 = 192.5 i.e. Trade Balance = Negative

2016: Imports = 55% of 350 = 192.5 and Exports = 75% of 250 = 187.5 i.e. Trade Balance = Positive

Thus, there are three instances when the trade balance is negative and two instances when the trade balance is positive. 

∴ Required ratio = 2 : 3

Hence, option (b).

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