Is My Fine Incorrect For 41 Over?

Hey guys, 141 in 100, what's my fine supposed to be?

Set fine ($6x41 = 246) is correct.

Total payable is $301

Based on $7*41 = $287 + $15 surcharge = $302 not $301

Is that a FATAL flaw and enough to get it tossed at my retrial on Sep 3?

$6 x 41km (=$246)

+ $50 victim surcharge

+ $5 costs

__________________

= $301

I have an explanation of fines on my site in the left column.