How much Qutubuddin Aibak had to pay for purchasing of Iltutmish?

How did Sultan Qutbuddin Aybak die?

Iltutmish appointed his first Subedar in Bihar to :

The capital of Qutbuddin Aybak was

At which place Iltutmish was appointed as governor for the first time?

In which year Iltutmish got recognition from the Caliph of Baghdad?