welcome to the forum, Green Gable. assuming your value you're checking is in A1, then do up a table say in C1:C4 containing the minimum values to get the amount & D1:D4 containing the values of the amount. then just:
=LOOKUP(A1,$C$1:$C$4,$D$1:$D$4)

or if you dont want the table:
=LOOKUP(A1,{0;10;20;30},{2400;4800;7200;9600})