Clara sells 600 cookies of the first type because 12*50 = <<12*50=600>>600.
She sells 1600 cookies of the second type because 20*80=<<20*80=1600>>1600.
She sells 1120 cookies of the third type because 16*70 = <<16*70=1120>>1120.
Thus, Clara sells 3300 cookies total because 600+1600+1120=3320 cookies.
#### 3320