Late fee calculation

[Sam Va]

Dear Experts - My tenant paid her rent 15 days late. According to the agreement, she is also supposed to pay a penalty of $200 ($50 fine + $150 for $10 per day). However, she has not paid this additional $200 by the next rent due date. Given this scenario, how do we calculate the penalties, and how much does she need to pay in penalties by the next rent due date? Thank You!