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**finalfantasy** hi, i'm having some trouble coming up with the 2nd function for this word problem:

a manufacturer makes 2 products, a and b. for each unit of a sold, the profit is 8 dollars, and for each of b, the profit is 11 dollars. it's been found that 25% more of a can be sold than of b. next yr the manufacturer wants a total profit of $42000. how many units of each product must be sold?

i found the profit function, but not sure how to go about for the 25% more of a than b part. thanks!