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a) 50-20=30
300-0=300
30/300=$0.10
b) 51.80-20=31.80
31.80/$0.10=318min
318min=5min 8sec
Ans: a) $0.10
b) 5min 8sec / 318min
300-0=300
30/300=$0.10
b) 51.80-20=31.80
31.80/$0.10=318min
318min=5min 8sec
Ans: a) $0.10
b) 5min 8sec / 318min