Answer : The Kenbak-1
Introduced in 1971, the Kenbak-1 is generally considered to be the world's first personal computer. Designed by John V. Blankenbaker, the Kenbak-1 included 256 bytes of memory, ran at an operating speed of about 1MHz, and sold for $750. Unlike many earlier machines it was a true stored-program (Von Neumann) computer. Unfortunately for Blankenbaker, the world wasn't quite ready for the personal computer. After selling only 40 machines, the Kenbak Corp. was forced to go out of business in 1973.