HACISALIHOĞLU KARADENIZ, M. .; KARAHAN, A. . Black Friday Discounts: Percentage Calculation Activities. Journal of Inquiry Based Activities, [S. l.], v. 10, n. 2, p. 83–99, 2020. Disponível em: https://www.ated.info.tr/index.php/ated/article/view/3. Acesso em: 16 sep. 2026.