(1) suppose there are x workers producing round iron sheets, then there are (42-X) workers producing rectangular iron sheets, 120x = 80 * 2 * (42-x) x = 24, so there are 42-24 workers producing rectangular iron sheets.

(2) If each individual ticket is one yuan, then each group ticket is 0.8a yuan. According to the question 120*(a-0.8a)=480 and a=20, so each group ticket is 0.8a= 16 yuan.