Look at the series 1.5, 2.3, 3.1, 3.9,…..What come next in the series?

Look at the series 1.5, 2.3, 3.1, 3.9,…..What come next in the series?

Explanation

Look at the series 1.5, 2.3, 3.1, and 3.9,   4.7

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1.5 +0.8=2.3

2.3+0.8=3.1

3.1+0.8=3.9

3.9+0.8=4.7