With math i have the answer which is ''c'' just need an explanation on how i got the answer.
a worker takes a random sample of 200 bolts and finds that 30 of them are either too long or too short, thus making them unusable. estimate the number of unusable bolts in a production of 17,000 bolts.

a. 2,260 bolts

b. 2,140 bolts

c. 2,550 bolts

d. 1,610 bolts
i know the answer is ''c'' i just need an explanation of how to get the answer.