Xiao Wei kept 400 yuan RMB in the bank for two years. After the maturity, he got back the principal and after-tax interest of 429.952 * * yuan, and asked Xiao Wei about the annual interest rate when he deposited. (1) Interest tax is no longer charged. Bank loans are calculated by simple interest, so the interest rate is (429.952-400)/400/2 *100% = 4.15%.

(2) Before, there were two interest tax rates: 5% and 20%.

The annual interest rate calculated at the interest tax rate of 5% is:

(429.952-400)/400/2/( 1-5%)* 100%=3.94%

The annual interest rate calculated at 20% is:

(429.952-400)/400/2/(1-20%) *100% = 4.68% or more is the algorithm. I hope you can give me a satisfactory answer.