Answer:
187 books
Explanation:
To find the minimum number of books she must sell to make a profit, we need to find the point where her revenue is greater than her cost, that is, R(x) > C(x).
Let's subtract the cost equation from the revenue equation to obtain R(x) - C(x):
R(x) - C(x) = 6.53x - (10,125 + 1.11x) = -10,125 + 5.42x
To make a profit, R(x) - C(x) must be greater than 0, so we can write:
-10,125 + 5.42x > 0
Adding 10,125 to both sides of the inequality, we get:
5.42x > 10,125
Finally, dividing both sides by 5.42, we get:
x > 186.6
So, the minimum number of books Anna must sell to make a profit is 187 books (rounded up to the nearest integer).