Out of 10 persons, 9 persons spent ₹15 each on their breakfast. The tenth person spent ₹9 more than the average expenditure of all of them. The total amount spent by all of them is:
Show answer & explanation
Correct answer: D
Explanation
The correct answer is Option 4 i.e. Rs. 160.
Average = Sum of observations/Number of observations
Now,
Per person cost spent on breakfast by 9 people = Rs. 15
Total amount spent by 9 people = 9 × 15 = Rs. 135
Let the average amount be x
So,
⇒ 10x = 135 + x + 9
⇒ 9x = 144
⇒ x = 16
Total amount spent by 10 people = 10 × 16 = Rs.160