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Unless I'm mistaken, you're looking at :

sage: [p[i]*1.2^-i for i in range(len(p))]
[-100.000000000000,
 8.33333333333333,
 6.94444444444444,
 5.78703703703704,
 4.82253086419753,
 4.01877572016461,
 3.34897976680384,
 2.79081647233653,
 2.32568039361378,
 1.93806699467815,
 1.61505582889846]

Pourquoi faire simple quand on peut faire compliqué ?

HTH,