In a survey of 200 students, fractions shown in circle graph.
(a) Radio?
(b) How many more than Music Video?
(c) Friend/Relative or Heard in Shop?

(a) 90
(b) 74
(c) 50
(a) Radio = 9/20 × 200 = 90. (b) Music Video = 1/10 × 200 = 20; 90 − 20 = 74. (c) Friend/Relative = 3/20 × 200 = 30; Heard in Shop = 1/20 × 200 = 20; Total = 50.