Answer: 3% to the closest whole percentage point.
Step-by-step explanation:
The bank interest cost is 10% based on 360 days.
Your firm needs funds for 90 days till the receivables comes in.
The relevant rate will be what the bank charges for 90 days;
= 10% * (90/360)
= 2.5%
= 3% to the closest whole percentage point.