Question : Excel formula? (part 2)

I need to know how to create a formula to handle a condition in a single cell.

Currently I have: =IF(G3<=499,35,IF(G3>=500,12,""))*G3

This is not quite right.

What I need to take into account is:

if G3 is greater than or equal to 500 = multiple the first 500 x 35, then multiply the remainder x 12.

How do I put this argument into a single cell?

Answer : Excel formula? (part 2)

Sorry.....attempt #3 -what I meant to post was

=IF(G3<500,G3*35,17500+12*(G3-500))