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Across
  1. 3. 300x40%(50-30)+100
  2. 4. 15x500%50-300+40
  3. 7. 60x9%2+800-90
  4. 8. 800%2+96x3-8
Down
  1. 1. 300-50x2%2
  2. 2. (53+39)x(48-108)%2
  3. 4. 826%2x9+3-4000
  4. 5. 10x40+52-43%4
  5. 6. (500-100)x(30+10)%2
  6. 9. 250%10x30-550+200