The task is to generate the correct answer for a given math problem.

Problem: a merchant sells an item at a 20 % discount , but still makes a gross profit of 20 percent of the cost . what percent of the cost would the gross profit on the item have been if it had been sold without the discount ?
50 %

Problem: if | x - 9 | = 3 x , then x = ?
- 4.

Problem: find the compound interest on $ 1000 in 2 years at 4 % per annum , the interest being compounded half - yearly ?

$ 82.43