Answer:
a-1. How long do you have to pay before the account is overdue?
a-2. If you take the full period, how much should you remit?
b-1. What is the discount being offered?
b-2. How quickly must you pay to get the discount?
b-3. If you do take the discount, how much should you remit?
c-1. If you don’t take the discount, how much interest are you paying implicitly?
c-2. How many days’ credit are you receiving?