To determine the percentage gain on the article, we analyze the statements:
Statement A: Selling the article for Rs. 120 less results in no profit or loss, indicating the selling price at that point.
Statement B: Selling the article for Rs. 30 more yields a 12.5% gain, providing a selling price and percentage gain.
Statement C: The cost price is Rs. 1,200, essential for calculating percentage gain
Combinations:
Combination (1): Any two statements do not provide enough information for percentage gain.
Combination (2): Statement C alone lacks selling price info.
Combination (3): Combining A or B with C allows calculation of the percentage gain.
Combination (4): Using all three statements provides complete information to calculate the percentage gain.
So, the correct option is (D) Any of them.