You would have to estimate this and a rough estimate would be around 240
The answer is C
By the way, that expression means "n choose k". Hope I helped!
Given,
The salary for the technician from shop A is $900 per week.
The salary for the technician from shop B is $25 per hour.
The equation for the total pay for shop B is,

Taking the total pay as 900. As, to make the shop A and shop B equal.

Hence, he would have to log 36 hours during a week at Shop B in order to match the salary at Shop A.
2 - 2n = 3n + 17 > -2n = 3n + 15 > -5n = 15 > n = -3