I need help with a formula based on the following:

B1 = 4.25
B2 = 5.25
B3 = 8.00
B4 = 12


B8 = 2 or 3
E10 = any number
G10 = any number
K10 will equal either hourly, B&B, or will be left blank

If B8=3 and K10 is blank, then H10 needs to equal B1*G10.
If B8=2, and K10 is blank, then H10 needs to equal B2*G10.
If K10=hourly, then H10 and I10 both need to equal 0 and J10 needs to equal
E10*B3
If K10=B&B, then H10 and J10 both need to equal 0 and I10 needs to equal
E10*B4


I think I'm getting part of the formula, but I don't know how to get it to
look at B8. Here's what I have but it doesn't work right.

=IF(K10="B&B","0",IF(K10="hourly","0",IF(K10=" ",IF(B8=3,G10*B4,G10*B3))))

Can anyone help? Thanks in advance!!
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Diogie