Fatto generale: 99 is a common price ending in psychological pricing.
Fatto matematico: 99 is the ninth repdigit, a palindromic number and a Kaprekar number.
Trivia: 99 is a common price ending in psychological pricing.
Data storica: April 8th is the day in 1992 that Retired tennis great Arthur Ashe announces that he has AIDS, acquired from blood transfusions during one of his two heart surgeries.