Correct Answer - Option 4 : 6.7%

**Given:**

Income of x = 80% more than of y

Income of z = 60% of the total income of x and y

**Concept used:**

Percentage of income of z is less than income of x,

⇒ [(x – z)/x] × 100

**Calculation:**

Let the income of y be 100 and income of x be 180 respectively(80% more than y).

And the income of z is 168 that is 60% of the total income of x and y

Percentage of income of z is less than income of x,

⇒ [(180 - 168)/180] × 100

⇒ [12/180] × 100

⇒ 6.7%

**∴ Income of z is 6.7% less than the income of x .**