could someone please give me a step by step explanation for this? this problem is new to me and i dont know which steps to take. it would be much appreciated!! <3

Alex drew a circle with right triangle prq inscribed in it, as shown below: the figure shows a circle with points p, q, and r on it forming an inscribed triangle. side pq is a chord through the center and angle r is a right angle. arc qr measures 80 degrees.

Diane owes $387 to her brother. if she debits her bank account $161.25 a month to pay him back, how many months will it take her to pay off the debt?

Pls will give brainliest and all p.s u can zoom in if u cant see plss