Having received a loan, a university student, Andrea, is now faced with working $20$ hours per week while studying her dream course. There are a few part$-$time job opportunities in town which is close to campus and Andrea must decide which of these she should apply for.

A patisserie offers a salary of $17$ and an a la carte restaurant offers a salary of $18$ per day. Andrea estimates the weekends will be busy with high tips whereas weekdays will be quiet with low tips. High tips are usually around $20$ for the patisserie and $15$ in the restaurant whereas low tips are around $5$ in the patisserie and $7$ in the restaurant. Andrea is looking for the job which would maximise her earnings.

This information can be represented as the decision tree below. Find the values of $A,B,C$ and $D$ in the tree.

A

B

C

D