Amanpreet wants to invest at most 42000 in the following three companies "A", "B" and "C". The rate of return Is 12% for "A", 15% for "B" and 10% for C. Due to the deals that these three companies have with each other, every investment must follow the following criteria At most one fifth of the money can be invested in "B" The amount of investment in "C" must be at least twice the investment in "A'. How much should Amanpreet invest in each company to earn the maximum profit? You can write the model here, but need to attach the excel file