First find the total revenue from the matinee tickets: $5/ticket * 200 tickets = $<<5*200=1000>>1000
Then find the total revenue from the evening tickets: $12/ticket * 300 tickets = $<<12*300=3600>>3600
Then find the total revenue from the 3D tickets: $20/ticket * 100 tickets = $<<20*100=2000>>2000
Then add the cost of each group of tickets to find the total cost: $1000 + $3600 + $2000 = $<<1000+3600+2000=6600>>6600
#### 6600