You will be given a definition of a task first, then some input of the task.
You are given a math word problem and you are supposed to apply multiple mathematical operators like addition, subtraction, multiplication or division on the numbers embedded in the text to answer the following question and then only report the final numerical answer.

Kyle bought a boat for 4500 dollars . 5 years later he sold it for 3600 dollars . What percent of the purchase price did Kyle lose ?
Output:
20