Hello @ScottMartin88 !
Try this!
IF({Applicants}>0,IF({Applicants}<2001,{Applicants}*101,IF({Applicants}<9001,2000*101+({Applicants}-2000)*85,IF({Applicants}<15001,2000*101+7000*85+({Applicants}-9000)*75,IF({Applicants}>15000,2000*101+7000*85+6000*75+({Applicants}-15000)*70)))))
Best,
Giannis, Implementation Consultant at thespelas.com