Uncle Zhou is going to deposit a sum of cash in the bank. After consultation, the bank's one-year time deposit (announced on July 20 1 1) has an annual interest rate of 3.5% and is fixed for two years. Let's assume that the cash that Uncle Zhou wants to deposit is X yuan:

4.4% * 2 * x-3.5% x-3.5% *( 1+3.5%)* x = 335.5

Biennial interest 1 one-year first-year interest 1 one-year second-year interest

Get: 8.8%x-3.5%x-3.6225%x=335.5.

Get 1.6775%x=335.5.

Get x=20000.

Uncle Zhou is going to deposit 20 thousand yuan in cash.

Thought I could help you.