Q4. International City Trust (ICT) has $5 million available for investment and wishes to maximize the interest earned from its investment over the next year. The specifics of the investment possibilities are shown in the Table below. Investment Return on Investment Trade Credits 'i'% Corporate bonds 10% Gold stocks 19% Platinum stocks 12% Mortgage securities 8% Construction loans 14% To encourage diversied investment portfolio, the board of directors has placed several limits on the amount that can be committed to any one type of investment: (I) No more than 25% of the total amount invested may be in any single type of investment, (2) At least 30% of the funds invested must be in precious metals (Gold and Platinum) (3) At most 45% must be invested in trade credits and corporate bonds. Formulate the problem as an LP model that maximizes the interest earned on its investments over the next year such that the conditions specified in the table above are met. (Do not solve it using excel solver)