In one shift, a certain disc jockey plays 11 rock songs, 17 jazz standards, and 7 disco tunes. What percent of the songs he plays are disco tunes? A. 7% B. 20% C. 31% D. 49% Provide an explanation :)

In the diagram, be and ad pass throughthe center of circle o, and the area ofsector aoc is 47.45 square units. what isthe area of sector boc? use the value =3.14, and round your answer to two decimalplaces.22.33 square units25.12 square units