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Every piece of paper –> 4 stars
20 pieces of paper –> 20 x 4 stars = 80 stars
Every 80 stars, 4 stars are damaged: 80 – 4 = 76 stars left

(a) $364.80 / $0.40 = 912 stars

(b) 
Every set have 76 stars left
Therefore, 
912 / 76 = 12 sets
12 sets x 20 pieces of paper = 240 pieces of paper. 

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(a)
364.80/0.40 = 912 (stars sold)

(b)
20 x 4 – 4 = 76
912/76 = 12
12 x 20 = 240

Ans : (a) 912 stars; (b) 240 pieces of paper.

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