Extracting Numbers from Text String

[2BLUE4U]

I'm trying to extract grade scores from text strings like this: B (85.2%)

I need a formula that will automatically populate the 2nd column like this...

B (85.2%)

85.2

I've tried so many different lookup formulas (including the one below) and none of them will extract the numbers correctly. Please help!

=LOOKUP(9.9E+307,--LEFT(MID(A2,MIN(FIND({1,2,3,4,5,6,7,8,9,0}, $A2&"1023456789")),999),ROW(INDIRECT("1:999"))))

 

[2BLUE4U]

THANK YOU SO MUCH!