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0x007102 = 100.000000
0x00350C = 500.000000

0x300515 / 1600 =? 860.99  Yes!

my $raw = 0x300515;
my $val = unpack('N', "\x00".pack('V', $raw))/1600

my $raw  = "\x30\x05\x15";
my $val = unpack('V', "$raw\x00")/1600;