Battery charge

Algebra Level 3

My phone was almost dead when I got a chance to charge it.
10min after charging the battery was 15% ;
20min after charging it became 27% ;
half an hour after charging it got 41% ;
another 10min passed and the battery was 57% ...
So how whats the percentage of my phone after I charged it for 55min?


The answer is 84.75.

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