how to make this kind of round function
1.10 =>1.10
1.11 =>1.10
1.12 =>1.10
1.13 =>1.15
1.14 =>1.15
1.15 =>1.15
1.16 =>1.15
1.17 =>1.15
1.18 =>1.20
1.19=>1.20
1.20 =>1.20

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If I am in the case, I will probably use round function as suggested by @pritaeas.
After rounding upper half and lower half, I will compare and use it's nearest rounding value.

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