=IF(G12>100000,((G12-100000)*0.015)+2250,IF(G12>20000,((G12-20000)*0.02)+650,IF(G12>15000,((G12-15000)*0.025)+525,IF(G12>10000,((G12-10000)*0.03)+375,IF(G12>5000,((G12-5000)*0.035)+200,IF(G12>5000,((G12-5000)*0.035)+200,G12*0.04))))))
Where the data is in G12