Answer:
Step-by-step explanation:
The total revenue exceeds or equal to the total cost. To solve for the break even:-
Therefore,
R > = C
Where R = 40x
40x > = 25x + 600
40x - 25x >= 600
15x >= 600
Divide both sides by 15
15x/15 >= 600/15
x >= 40
The interval where the product will at least break even is 40, and infinite.