28.0 florins
Explanation:
Knowing that we have 10 guilders and the exchange rate is 1.0 guilders for every 2.8 florins we devise the following reasoning:
if 1 guilder is equal to 2.8 florins
then 10 guilders are equal to X florins
X = (10 × 2.8) / 1
X = 28.0 florins
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