When given percents, it is easier if you remember these proportions

If an item must be sold at a net profit of 25%

CP ------ Profit ------ SP

100 -------25 ------ 125

4 ------- 1 ------- 5(Proportion)Similarly if the item is to be sold at a net loss of 25%

CP ------ Loss ------ SP

75 -------25 ------ 100

3 ------- 1 ------- 4These proportions have been done

considering 100 as CP for Profit questions

and 100 as SP for Loss questions.

Using this proportions we can come back to the question in hand.

He buys a concompany ticket for $156(sells at a profit of 25%)

and a mezzanine ticket for $184(sells at a loss of 25%)

So 156 is 4 parts, 1 part(profit) is +39

and 184 is 4 parts, 1 part(loss) is -46

Net profit or loss = +39 -46 = -7(Option B)

P.S if you memorize these proportions for the basic profits like 10,20,25,50 and loss,

it will make things a lot easier. However it not as difficult to deduce at that time also.

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