A catering investment project invested 5 million yuan and 3 million yuan in 1 and 2 years respectively, which was put into production at the beginning of the third year and realized in the third and fourth years. According to the meaning of the question, the catering investment project will invest 5 million yuan and 3 million yuan in 1 and 2 years respectively, and will be put into production at the beginning of the third year, and realize annual income in the third and fourth years. We need to calculate the annual income in the third and fourth years.

First of all, we need to know the average rate of return of the catering industry to determine the expected return of investment projects. According to industry statistics, the average yield of catering industry is about 10%~20%. Here we assume that the expected rate of return of this investment project is 15%.

If the investment of 1 year is 5 million yuan and the expected rate of return is 15%, the expected return of 1 year is 5 million yuan ×15% = 750,000 yuan.

If the investment in the second year is 3 million yuan and the expected rate of return is 15%, the expected rate of return in the second year is 3 million yuan ×15% = 450,000 yuan.

After the third year of production, we need to calculate the annual income of the third and fourth years. Assuming that the annual income in the third year and the fourth year is X million yuan and Y million yuan respectively, there are:

X = (5 million+3 million) × 15%+ third income.

Y = income in the third year.

According to the question, it will be put into production at the beginning of the third year, so the annual income of the third year should be low. We assume that the annual income in the third year is 2 million yuan, including:

X = (5 million+3 million) ×15%+2 million = 1.55 million+2 million = 3.55 million.

Y = 200 million yuan

Therefore, the annual income of catering investment projects in the third and fourth years is 3.55 million yuan and 2 million yuan respectively.