A bookstore costs $78 a day to keep open, and it spends $14 for each book that it sells. If each book sells for $20, what is the break-even point for this
bookstore?
O A. n= 14
O B. n= 13
O C. n = 22
O D. n = 20

13

Step-by-step explanation:

13

∠acb = 8°

step-by-step explanation:

∠xba lies on the circle and is half the measure of the intercepted arc ax

hence

measure of arc ax = 2 × 42° = 84°

∠acb is outside the circle and is

∠acb = (arcab - arcax ), hence

∠acb = 0.5 (100 - 84) = 0.5 × 16° = 8°