Which sentence is grammatically correct? 

a) She have been working here for three years, 

b) She has been working here for three years.

Give a suitable title to the passage?

Why does the Government allow payments to be made in paper notes?

What is the significance of the value of the number of coins that is printed upon them?

Why should the prices of commodities go up when there is plenty of paper money?

Why does the Government print only a certain number of paper notes, and not as many as it likes to p?