30 people went to a restaurant for a dinner party. 20 of them paid ₹880 each and each of the rest of them paid ₹110 more than the average of the total expenses. What was the total expense (in ₹) for the dinner?
Answer & explanation
Correct answer: option 3
Let average bill = X
Total bill = 20 × 880 + 10(X + 110)
= 17600 + 10X + 1100 = 18700 + 10X
ATQ ,
X = \(\frac{18700 + 10X }{30}\)
30X = 18700 + 10X
20X = 18700
X = 935
Total bill = 30X = 30 × 935 = 28050