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Out of nine persons, 8 persons spent ₹30 each for their meals. The ninth one spent ₹20 more than the average expenditure of all the nine. The total money spent by all of them was
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- ₹260
- ₹290
- ₹292.50
- ₹400.50
- ₹260
Correct Option: C
Expenditure of 9th person = ₹ y
| ∴ y - | y + 8 × 30 | = 20 |
| 9 |
| ∴ | 9y - y - 240 | = 20 |
| 9 |
⇒ 8y – 240 = 180
⇒ 8y = 240 + 180 = 420
⇒ y= 420÷8 = 525 .
Total expenditure = 52.5 + 240 = 292.5
