PLEASE HELPP! Will give brainlist if real answer! No links please. Explain the historical circumstances that led to the development of use of quipu in the incan Empire. (why did they use/what led to the use of the quipu)

Quipu, Quechua khipu (“knot”), quipu also spelled quipo, an Inca accounting apparatus in use from c. 1400 to 1532 ce and consisting of a long textile cord (called a top, or primary, cord) with a varying number of pendant cords. The pendant cords may also have cords (known as subsidiaries) attached.

A quipu usually consisted of cotton or camelid fiber strings. The Inca people used them for collecting data and keeping records, monitoring tax obligations, properly collecting census records, calendrical information, and for military organization.