Actually 335/15 is 22.33333
320/15 is 21.33333
The difference is 1/22.3333
.0447
= .05
English
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The percentage increase should work from the existing base of 320. That is what you are calculating the increase against...
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Actually if you are rounding to one decimal point you only use the second digit, so the answer is 0.4.
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Round em all ... MWAHAHAHAHAHAHAHA
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Either way it's a pointless update to the light level