Calculate the compound interest earned over a period of 6 months on $30000 at an interest rate of 20% per annum. The interest is compounded quarterly.

[dmitrii_fediuk]

30000 * (1 + 0.2 / 4) ^ (4 * 0.5)
1.05 ^ 2 = 1.1025
1.1025 * 30000 = 33075
33075 - 30000 = 3075

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