exam Maths Puzzle Numerical Ability

I have a mathematical modeling problem that I am having trouble solving. Please help.
When buying or selling stock for a customer, the Mark Hodge Agency charges $40 plus 8 cents p

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A 25% SOLUTION OF ALCOHOL IS TO BE MIXED WITH A 40% SOLUTION TO GET 50l OF A FINAL MIXTURE THAT IS 30% alcohol. How much of each of the original solution should be used? Acme Communication finds that the total revenue function associated with producing a new type of cell phone is R(X)=218X-X^2, AND THE TOTAL COST FUNCTION IS C(x)=6000+9x, where x r