You didn't give your actual dates, but the full Month of July is Magic Season.
Weekdays (Sun-Thu), 14 pts/day for a studio, or 30 pts/day for a 1-B/R.
Weekends (Fri/Sat), 32 pts/day for a studio, 60 pts/day for a 1-B/R.
Knowing the actual days of the week for your current reservation, and how many points you 'purchased', you should be able to figure out how many points additional to change to a 1-B/R. (Basically, about double the points compared to a Studio)