It is 0.9 (or 0.90 if you wish to emphasise the precision).
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To convert 156% to decimal notation divide by 100: 156% ÷ 100 = 1.56
19/20 = 95/100 = .95.19 over 20 as a decimal is 0.95
1 over 100 as a decimal is 0.01
4 over 100 in decimal is 0.04. we take 4/100 = 0.04 in decimal
7/20 = 35/100 so, as a decimal, it is 0.35