This equation works for any number of empty jars where x gives the number of empty jars. To solve this question, what we need to do is to substitute 70,000 for x.
Hence, C(x) = 0.3(70,000) + 15,000
C(x) = 21,000 + 15,000
C(x) = 36,000
This means to produce 70,000 jars, we need a total amount of 36,000
