cash equalivant

cash in bank is current assests

Yes it depends of inventory nature if inventory can immediately be sold to sales then it is cash equivalent.

Difference between cash and cash equivalent is that cash equivalent is not cash like other cash but it is so liquid that it can be converted to cash immediately when required like marketable securities while cash provided from operating activities means cash generated by selling goods to customers.

postage stamps are not considered cash or a cash equivalent. The reason is that stamps are not considered as liquid as cash because you can not demand cash payment for them.