Isabella paid one of her bill late and owed a 4% late fee was 780. How much was Isabella's original bill in dollar
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For this case we have the following quadratic functions:
Revenue:
Cost:
Then, we observe that the profit is given by the following mathematical relationship:
Substituting values we have:
Making the corresponding calculations we have:
Answer:
An expression that represents the profit is:
Suppose you can factorize:
Then by expanding the right side, you have
which means in this case, you have to have
Then by expanding the right side, you have
which means in this case, you have to have