In this case, we'll have to carry out several steps to find the solution.
Step 01:
Data
tests and medicine = $150
appointment = $30
discount = 15% = 0.15
visits = 3
final cost = ?
Step 02:
final cost:
final cost = (150 + 30*3) - (150 + 30*3)*0.15
= 240 - 36
= $204
The answer is:
The final cost is $204