30 students were asked to bring in 12 brownies so they will bring in 30*12 = <<30*12=360>>360 brownies
20 students were asked to bring in 24 cookies each so that’s 20*24 = <<20*24=480>>480 cookies
15 students were asked to bring in 12 donuts each so that’s 15*12 = <<15*12=180>>180 donuts
Together, they have 360+480+180 = <<360+480+180=1020>>1,020 treats
If they sell all the treats for $2.00 each then they will make 1020*2 = $<<1020*2=2040.00>>2,040.00
#### 2040