Confusing cost statement but simple


(Guest)

Three friends went to a Hotel and took three rooms @ Rs.100 each.

Total bill came to Rs. 300.

A discount of Rs. 50 was given to them.

Room boy returned this money to three friends.

Three friends gave Rs. 20 of this as tip and divided Rs 30 (ie. Rs. 10 each ) among them.

Now expense incurred by each of them will be Rs. 100-10 = 90.

Total Room Rent incurred: 90 X 3 = 270
Tip given                              : 20 X 1 =    20
Total Expenditure                                 290

Now Rs. 300 was the bill. Expenses incurred were Rs. 290. Now Rs. 10 is missing.

 

Can you find it?