book Maths Puzzle Numerical Ability

i want to know how we solve this problewhat is the quantity of a profit of 250 dollars

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book Other Question

The sum of the squares of two consecutive integers is 13. Find the integers and explain your steps as you solve.
Slove the Problem:
the matching section of an exam has 5 questions and 8 possible answers in how many different ways can a student answer the 5 question, if none of the answer choices can be repeated?