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.