Buil the mathematical model of this integer programming problem (just the model)

Jack has 1,000,000 dollars for investment. there are two types of investment, low-risk investment and high-risk investment. every type of investment has 5 products, and if you purchase the product you need to pay the threshold fee (fixed cost), as table below

Jack has some investment rules which are:

-low-risk product's investment quota should not be lower than 60%

-investments product (A/B) cannot be more than 5, in which high-risk products cannot be more than 2

-for high-risk products, every product investment cannot exceed 300,000, and for low-risk products, every product investment cannot exceed 400,000

-if you invest in product A3 you need to invest in product A1 too

-to invest in product B5, you need to first invest in product B4 OR A4

you don't need to solve this problem, you just need to build the mathematical model, and because this is integer programming problem all the variable should be integer

low risk product return rate threshold cost product A1 3.50% - B1 A2 3.75% 1000 B2 A3 4.00% 1500 B3 A4 3.80% 1200 B4 A5 3.80% 1200 B5 high risk return rate threshold cost 5.50% 2000 6.00% 2500 5% 1800 7% 3000 7.50% 3000 low risk product return rate threshold cost product A1 3.50% - B1 A2 3.75% 1000 B2 A3 4.00% 1500 B3 A4 3.80% 1200 B4 A5 3.80% 1200 B5 high risk return rate threshold cost 5.50% 2000 6.00% 2500 5% 1800 7% 3000 7.50% 3000