if the startuing values are entered a vlookup should suffice, something
like

0 5
0.01 6
1.01 7
2.01 10
5.01 12
7.01 15

If your cell value to lookup is in c1 something like the following
should work

vlookup(c1,$a$1:$b$36,2)

Regards

Dav


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