Find the missing number of the series. 0.5, 0.55, 0.65, 0.8, ..

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1. ANSWER is ==> 1

   1st step : 0.5
   2nd step : 0.5+0.05 = 0.55
   3rd step : 0.55+0.10 = 0.65
   4th step : 0.65+0.15 = 0.8
   5th step : 0.80+0.20 = 1.00

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