Chocolate boxes

This task is about working out the weight and price of boxes of chocolate.
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A dairy owner bought 10 boxes of chocolate bars. Each full box weighed 5 kg. Each chocolate bar weighed 250 g. (Remember that 1000 g = 1 kg).

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a)  How many chocolate bars were there in the 10 boxes altogether?  bars

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b)  Redwood School wanted 80 chocolate bars for their gala.
     How many boxes would they need to buy?  boxes

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c)  If each chocolate bar cost 95c, how much would all 80 bars cost? $

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d)  The dairy owner sold \(1 \over 4\) of the chocolate bars on the weekend.
     How many kilograms did she sell? kg