Q: At the time of which sultan people got high income?  

Tughlaq instituted economic policies to increase the material welfare of his people. Many rest houses (sarai), gardens and tombs were built. A number of madrasas were opened to encourage literacy. He set up hospitals for the free treatment of the poor and encouraged physicians in the development of Unani medicine. He provided money for the marriage of girls belonging to poor families under the department of Diwan-i-khairat. He commissioned many public buildings in Delhi. He built Firoz Shah Palace Complex at Hisar in 1354 CE, over 300 villages and dug five major canals, including the renovation of Prithviraj Chauhan era Western Yamuna Canal, for irrigation bringing more land under cultivation for growing grain and fruit. For day-to-day administration, Sultan Firoz Shah Tughlaq heavily depended on Malik Maqbul, previously commander of Warangal fort, who was captured and converted to Islam. When Tughlaq was away on a campaign to Sind and Gujarat for six months and no news was available about his whereabouts Maqbul ably protected Delhi. He was the most highly favoured among the significant number of the nobles in Tughlaq's court and retained the trust of the sultan. Sultan Feroze Shah Tughlaq used to call Maqbul as 'brother'. The sultan remarked that Khan-i-Jahan (Malik Maqbul) was the real ruler of Delhi.

At the time Firuz Shah Tughlaq people got high income.