Delhi: 12th to 15th Century — Social Science STD 7 — Question

The early years of Muhammad Tughluq's reign faced Mongol attacks, which were curbed by Tughluq's sincere efforts.
He took several administrative measures like Alauddin Khalji he also raised a huge standing army in Delhi.
He got emptied the oldest of the four cities of Delhi (Delhi-i Kunba) in order to garrison his soldiers there. The residents of the old city were sent to the new capital of Daulatabad in the south.
He made arrangements for the collection of produce as tax to feed the soldiers. As it was very difficult to maintain a large number of soldiers the Sultan levied additional taxes which coincided with famine in the area.
Muhammad Tughluq paid soldiers cash salaries. For this he introduced 'token' currency made of cheap metals. People in the 14th century did not trust these coins. They saved their gold and silver coins and paid  all their taxes to the state with this token currency.