All the cakes yielded 10 * 8 = <<10*8=80>>80 slices
Since Didi was selling each slice for $1, it means she sold everything for 80 * 1 = <<80*1=80>>80 dollars.
The first business owner donated 50/100 * 80 = <<50/100*80=40>>40 dollars.
The second business owner donated 25/100*80= <<25/100*80=20>>20 dollars
Adding both amounts gives 80 + 40 + 20 = <<80+40+20=140>>140 dollars
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