This question was previously asked in

SSC CGL Tier-II ( JSO ) 2016 Official Paper ( Held On : 2 Dec 2016 )

Option 4 : decreased by Rs. 2

**Formula**

Average = sum of observation/total number of observations

**Calculation**

Let the uniform wages of 9 workers be Rs. x per worker

Total wages of 9 workers = 9x

After adding 10th worker whose wage is 20 less than the other then total wages of all 10 workers

⇒ 10x - 20

⇒ Average wages = (10x - 20)/10 = x - 2

**∴ The new average wage is Rs. 2 less than the previous wages of Rs.x**

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