Answer:1,440
How I know: Im not a geek or anything(not that there is nothing wrong with them) but all I did was : 30*24=720 and then 720*2=1,440 so that being said 1,440 is the answer that I came up with. Also if you think about it is really simple : they are selling 30 min. for 24 hours in a day and 7 days a week BUT the question is only having 2 days a week...
Hope this helps and hope you pass ;)