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Math·Problem-Solving and Data Analysis·Percentages

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A researcher investigated two species of mites: a predator and its prey. At the start of a week, there was an equal number of the two species. At the end of the week, the number of prey had increased by $1400\%$ of the number of prey at the start of the week, and the number of predators had increased by $170\%$ of the number of predators at the start of the week. The number of predators at the end of the week was $p\%$ less than the number of prey at the end of the week. What is the value of $p$?

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