book costs Rs. 78 and Peter bought 60 such books. By mistake, the accountant at the store ade the bill by taking the cost of each book to be Rs 12 less. What is difference in this bill? Peter decided to give that difference to the opkeeper If you were in Peter's place what will you do? Which of integers is used here?

1) 990

2) I would have gone to the same shop and returned the extra money to the shopkeeper.

1) cost per book = Rs 78

cost of 60 books = Rs 60*78 = Rs 4680

selling price per book = Rs 78-12 = Rs 66

selling price of 60 books = Rs 66*60 =

Rs 3960

now difference = 4680-3960 = Rs 990

2) I would have returned the money to the shopkeeper as they have earned the money by using their effort and if we try to take their money away from them then their might be some problems. So we should respect their effort and return extra money if we get it.