The annual interest rate of the bank's two-year deposit is 3.85%. After Aunt Liu deposited some money in May 2004, she withdrew a total of 21232 yuan of principal and after tax interest two years later. What is the principal deposited by Aunt Liu? (the interest rate is 20%) Help to list the formula, or you can't understand it. Thank you

Principal and interest need to be calculated separately
Interest = x (1 + 3.85%) ^ 2 after tax interest = interest * (1-20%)
Principal + interest after tax = 0.8x (1 + 3.85%) ^ 2 + x = 21232
This is the formula
I can't do it without a calculator

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