A business man bought some items for ₹600. Keeping 10 items for himself he sold the remaining items at a profit of ₹5 per item. From the amount received in this deal he could buy 15 more items. Find the original price of each item.

There are 5% defective items in a large bulk of items.What is the probability that a sample of 10 items will include not more than one defective item?

Lot of 100 items contains 10 defective items.Five itwms are selected at random from the lot and sent to the retail store.What is the probability that the store will receive at most one defective item?

A shopkeeper decides to sell a certain item at a certain price. He tags the price on the item by increasing the decided price by 25% . While selling the item, he offers 20% discount. Find how many more or less per cent he gets on the decided price.