A shopkeeper buys three varieties of coffee powders of 132/-, 160/- and 192/- per 100 gm respectively and mixes them in the ratio of 9 : 2 : 1. The marked price per 100 gm of mixed coffee powder is 238/-. The shopkeeper given a discount equal to 1/x th of the marked price and shall earns a profit of 40%, what is the value of x?
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