MBA Exam Numerical Ability Profit and Loss

If the selling price of 10 apples is equal to the cost price of 14 apples, which, in turn is equal to one-third of the total discount offered upon 70 apples. Then find the profit / loss percentage when the mark-up percentage is halved and the discount percentage is decreased by 5 percentage points.

1) 12.5% profit
2) 20% profit
3) 7.5% loss
4) 12.5% loss
5) 10% loss

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MBA Other Question
If f (x) = f (x – 1) + f (x + 1), where f (10) = 6 and f (20) = 2 f (21), then f (16) =post your answer..Please give your approach as well..

1) -6
2) 6
3) 3
4) -3
 Out of n consecutive numbers , four numbers are selected such that the differences of all possible pairs are distinct. What is the least value of n for which this is possible?Please give a detailed approach with the answer.

1) 6
2) 7
3) 8
4) 9