A refund of that size is highly unusual..... and 10 percent of $10,000 is $1,000, not $100.
But interest rates assume an entire year....365 days. APR = Annual Percentage Rate
10,000 x 4% = $400, not $40. Divide that by 365 to get the daily rate...$1.10 per day
If you got $40 per day interest, that would equal $14,600 in just interest for a year, which makes no sense.
