UK Xbox 360 sales up 40%

[Mistershine]

Is it 40% in one day or for the whole week? It looks like he's saying that on friday the 360 sold 40% more than last week.
Did it:
A: Sell 40% more than the previous friday.
B: Sell 40% more than the previous week as a whole.
C: Sell 40% more than the previous week in just 1 day-friday.