Sum cells after applying a formula

Hello everybody,

Probably really basic but this is not working for me.

I have a column (A) which has two elements in each cell, the # (number) of bookings and the total amount of hours.
Each cell looks like this:

(1) 4.00
(5) 3.33
(19) 54.50
(30) 75.25

I wanted to separate the two values and I manage to do it (probably in a really complicated way, but it works).
After transformation everything looks like this:

original	#	Time (h)
(1) 4.00	(1)	 4.00
(5) 3.33	(5)	 3.33
(19) 54.50	(19)	 54.50
(30) 75.25	(30)	 75.25

The formulas used were:

=IF(ISTEXT(A2),LEFT(A2,SEARCH(")",A2)),"")
=IF(ISTEXT(A2),RIGHT(A2,LEN(A2)-SEARCH(")",A2)),"")

My problem now is that the total amount of hours is not recognized as number and I can not make basic functions like sum on these cells.
Could anyone look at this and let me know how I can solve it?

The attached file has an example where you can work on.

Thank you all in advance,
Joćo