I don't think this question is accurate. First of all, what is the fixed investment period? There is a big difference between monthly fixed investment and weekly fixed investment.

Is annualized income a nominal interest rate or a real interest rate?

Now let's make an assumption: invest in 500 yuan every month with a nominal interest rate of 8%, and the investment income after five years of investment is calculated as follows:

F=A*(( 1+i)^n- 1)/i

Where: the final value of F annuity A annuity N interest multiplied by I actual interest rate.

a = 500n = 12 * 5 = 60 I = 8%/ 12 = 0.667%

The calculation result F=36738.43 yuan.

In other words, the total capital after five years is 36,738.43 yuan.