Something's out of sync in your numbers, or else there's additional info in the problem you omitted. For example, if (as stated) the pre-tax gain is 15,200 while the after-tax gain is just 5,494, that indicates that a tax bite of 9,706, which is substantially north of 50% of the pre-tax gain (whereas your info indicates an effective tax rate of 33%).
Letting P denote a pre-tax gain; t represent the tax rate (as a decimal); and A denote the after-tax gain, P and A have the equivalent relationships
A = P x (1 - t)
P = A / (1 - t)= P x (1 - t)
A = [bbcode][/bbcode]/ (1 - t)
So if the pre-tax gain [bbcode][/bbcode]is 15,200 the after-tax gain [bbcode][/bbcode]would be 10,184. On the other hand, if the correct after-tax gain is 5,494 then the pre-tax gain must be 8,200.
Go back and check the problem carefully.
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