When the movie is half over, the price of popcorn is half of the full price.
Full price of popcorn = $3.50
Half price of popcorn = $3.50 / 2 = $1.75
The price of drinks is given as $1.35.
Now, to calculate the total cost for 3 orders of popcorn and 3 drinks:
Cost of 3 orders of popcorn: 3 orders × $1.75 = $5.25
Cost of 3 drinks: 3 drinks × $1.35 = $4.05
Now, we add these two amounts together: Total cost = Cost of popcorn + Cost of drinks Total cost = $5.25 + $4.05 = $9.30
Thus, the total cost for purchasing 3 orders of popcorn and 3 drinks when the movie is half over is 9.30.