Question : The average daily expenditure of Mohan over 4 days is INR 120. If his expenditure on the first 3 days are INR 60, INR 150 and INR 140, respectively, then what is his expenditure on the $4^{\text {th }}$ day?
Option 1: INR 145
Option 2: INR 110
Option 3: INR 130
Option 4: INR 120
Correct Answer: INR 130
Solution :
Average daily expenditure of Mohan over 4 days = INR 120
Sum of expenditure over 4 days = 120 × 4 = 480
Expenditure on the first 3 days = INR 60, INR 150 and INR 140
Let $x$ be the expenditure on the $4^{\text {th }}$ day.
So, $x$ + 60 + 150 + 140 = 480
⇒ $x$ = 480 – 350 = 130
Hence, the correct answer is INR 130.
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