. 28 (album), a 2005 electronic music album by aoki takamasa and tujiko noriko. twenty eight (card game), an indian trick taking game for four players. twenty eight, a nickname for the …. 28% percent calculator. use this calculator to find percentages. just type in any box and the result will be calculated automatically. calculator 1: calculate the percentage of a number. for example: 28% of 25 = 7. calculator 2: calculate a percentage based on 2 numbers. for example: 7 25 = 28…. . .