The spirit initially had 200 florins. Let x = 200.
Each year, the spirit's wealth increased by .5 of the previous amount.
At the end of the first year, he had 1.5x.
At the end of the second year, he had 1.5 * 1.5x.
At the end of the third year, he had 1.5 * 1.5 * 1.5x... and so on.
So eighteen years later, the spirit had (1.5^18)x = 1477.8919 * 200 = 295,578.376
Answer: 295,578.376 florins
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