Total Energy Loss in Collisions

Blocks of masses m,2m,4m and 8m are arranged in a line on a frictionless floor. Another block of mass m, moving with speed v along the same line (see figure) collides with mass m in perfectly inelastic manner. All the subsequent collisions are also perfectly inelastic. By the time the last block of mass 8 m starts moving the total energy loss is p\% of the original energy. Value of 'p' is close to :

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