Correct Answer - Option 4 : 42%
Calculation:
Total people = 100%
12% have both brown hair and eyes
40% have brown hair
⇒ People with only brown hair = (40 - 12) = 28%
30% have brown eyes
⇒ People with only brown eyes = (30 - 12) = 18%
∴ People with neither brown hair nor brown eyes = 100 - (28 + 18 + 12)
⇒ 100 - 58
⇒ 42%
∴ People with neither brown hair nor brown eyes are 42%.