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.

Georgia needs to buy flea treatment for her dog. pet store 1 is offering the flea treatment for 40 percent off plus an additional 25 percent off their regular price of $33. pet store 2 is offering the same flea treatment for 55 percent off plus an additional 5 percent off their regular price of $34. which location is offering the better price and how much cheaper is it? the flea treatment is $0.31 cheaper at pet store 2. the flea treatment is $1.05 cheaper at pet store 2. the flea treatment is $2.05 cheaper at pet store 1. the flea treatment is $2.36 cheaper at pet store 1.