It's .28 bitcoins the most he's lost is $10.
400$-300$ * 0.28 = 28$ > 10$
28$=0.09
BTCThat is what he meant.
You won't make a loss since your purchase was in $. The amount you said if i was to accept in USD and not in bitcoins is : (it was 0.3 before)
Interest calculation at bitcoin price of
340$ comes to
I could do .275 for $6 interest, and I'll cover the full amount lost down to $395 if they drop before I repay you. They're at $401 right now.
$6 = 0.0176
0.28 * 395-340 = 15.4$ = 0.0453
so total 0.017+0.045 = 0.062.
Without considering the extra 4 days (over and above max 3 days) and putting price at 340$.