Can you create multiple IF formulas on one cell?

I am trying to create a formula so that when a certain number appears in the cells in Column F that the logic applies the correct PayPal fee in Column G.  The fee is not set percentage, so I can't make it a math formula.  The fee percentage changes the higher the value.  I used the "IF" formula to say that when the cell in Column F is $45 then put $1.39 in the cell in Column G.  BUT - F could also be $90, $135 or $180.  I want the formula to say that if F is $45 then G is $1.39; if F is $90 then G is $2.28; if F is $135 then G would be $3.18 and if F is $180 then G would be $4.07.  I don't know how to give the formula 4 different options of which fee to put into Column G.  Thanks for the assistance!