We have the conversion of kg=lb as 1kg=2.2lbs
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Converting the weight of the box to pounds you'll have
[tex]34kg( \frac{2.2lb}{1kg} ) = 74.8lbs[/tex]
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Baggage allowance is 50 lb so the excess will be:
74.8lb - 50lb = 24.8lb
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payment for the excess will be:
24.8lb ($5) = $124