|Maybe it's just me, but I can interpret 10% or more higher than the score value in D20 in 2 different ways:|
D20 + 0.1
D20 + 0.1*D20
In other words, 10% or more higher than the score value in D20 could mean "add 10%" or it could mean "increase the value by 10% of the original value". Again, maybe it's just me.
Anyway, if you literally want to "add 10%" then your Conditional Formatting formula would be:
When that formula is TRUE, the cell should turn green.
If you are checking for values that are higher by 10% of the original value, then you would use this formula:
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