How to find the solution to an inequality with subtraction Practice Test

and are both integers.

If , , and , which of the following is a possible value of ?

The cost, in cents, of manufacturing x pencils is 1200+20x, where 1200 is the number of cents required to run the factory regardless of the number of pencils made, and 20 represents the per-unit cost, in cents, of making each pencil. The pencils sell for 50 cents each. What number of pencils would need to be sold so that the revenue received is at least equal to the manufacturing cost?