If you let x equal the number of devices sold, then you know the revenue from the devices will be:
9x
However, the cost to make the devices will be:
6.5x.
Therefore, the profits will be:
9x-6.5x = 2.5x.
The company must make more than $125,000; thus,
2.5x > 125,000
x > 50,000
The company must sell more than 50,000 units