Answer :

1) round to 3000/25 and you get 120
2) round to 5500/75 and you get 73
3) round to 2500/10 and you get 250
4) round to 3000/50 and you get 60
5) round to 1500/50 and you get 30
6) round to 5500/100 and you get 55

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