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If 1/5 of the cakes are fruitcakes, then \(1- \frac{1}{5} = \frac{4}{5}\) of the cakes are sponge cakes.  To convert to a percentage, we simply multiply by 100, for a result of \(\frac{4}{5}*100= \frac{400}{5}=80\) percent sponge cakes.

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