Multiple If Conditions-incorporated

I am trying to incorporate multiple if conditions into a formula.

If g6 is less than .25*g13, f6 = 2.5

If g6 is greater than .25*g13 (BUT) less than .50*g13, f6 = 5

If g6 is greater than .5*g13 (BUT) less than .75*g13, f6 = 7.5

if g6 is greater than .75*g13 (or) equal to g13, f6 = 10

Thank you.

You could also work the other way round;

=if(G6>0.75*G13,10,if(G6>0.5*G13,7.5,if(G6>0.25*G13,2.5,if(G6=G13,10))))

Hope this helps

Peter1999