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Sagot :

Bonsoir,

1)

20h -> 216€

1h -> 216/20

17h30  = 17,5h

17,5 -> (216*17,5) /20 =>189€

2)

216€ -> 20h

1€ -> 20/216

267, 30 -> (20* 267,30)/216 =>24,75h

0,75h = 45mn

(0,75*60)/ 100

24, 75 h = 24h 45mn

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