In November 2012, the annual interest rate of fixed deposit for two years was 3.75%, and my mother saved 10000 yuan. When the fixed deposit matures for two years, I can get a total of ()

The interest is calculated as follows:
10000x3.75% x2 = 750 yuan
Total principal and interest: 10000 + 750 = 10750 yuan

My mother deposits 4000 yuan in the bank for three years with an annual interest rate of 3.24%. When it matures, how much interest does my mother get? Mr. Zhao deposits a sum of money in the bank,
Mr. Zhao deposits a sum of money in the bank for three years. The annual interest rate is 4.50%, and the interest after three years is 243 yuan. How many yuan did Mr. Zhao deposit? Is the interest in these two questions after tax interest? Our teacher said yes, but all the answers in the exercise book I bought say it's not after tax interest?
Good brothers and sisters, please help me. Tomorrow is the exam. If you don't do well, Wuwu

Interest = principal * interest rate * deposit period
Interest tax = interest * interest rate
After tax interest = interest - interest tax
This question does not say how much the interest tax is. The default interest tax is 0, that is, interest = after tax interest
Available: 243 = x * 4.5 / 100 * 3
The deposit x = 1800 yuan, 243 is the interest after tax

Xiaolan's mother will deposit 5000 yuan in the bank for three years, with an annual interest rate of 3.33%?

Interest = 5000 × 3 × 3.33% = 499.5 yuan

My mother deposits 10000 yuan in the bank for two years with an annual interest rate of 4.14%. After maturity, she deposits the money out of the bank for two years on a regular basis. After maturity, how many yuan can she get back?

Total principal and interest = 10000 * (1 + 2 * 4.14%) * (1 + 2 * 4.14%) = 11724.56 yuan

In November 2012, the annual interest rate of fixed deposit for two years was 3.75%, and my mother saved 10000 yuan. When the fixed deposit matures for two years, I can get a total of ()