Tiered Pricing Model

Hi Guys,

I'm trying to create a tiered revenue model with variable rates. The current equation I am using is really bulky and takes forever to work through. Does anyone know of a simpler way to do this? I've attached the excel workbook below... To convert BPS to % please divide by 10,000.


=IF(C14<=$A$4,C14*$C$7/10000,IF(C14<=$B$4,(C14-$A$4)*$C$8/10000+$A$4*$C$7/10000,IF(C14<=$C$4,(C14-$B$4)*$C$9/10000+$B$4*$C$8/10000+$A$4*$C$7/10000,IF(C14<=$D$4,(C14-$C$4)*$C$10/10000+$C$4*$C$9/10000+$B$4*$C$8/10000+$A$4*$C$7/10000,IF(C14>$D$4,(C14-$D$4)*$C$11/10000+$D$4*$C$10/10000+$C$4*$C$9/10000+$B$4*$C$8/10000+$A$4*$C$7/10000)))))