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It is necessary to mention that the two triangles are similar.

Let the perimeter of the triangle MNP be x cm.

Since the triangles XYZ and MNP are similar triangles,

8/12 = x/80 (multiply both sides by 80)
640/12 = x
53.3333... = x
53 3/9 = x
53 1/3 = x

Thus, the perimeter of the triangle MNP is 53 1/3 cm.

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