Yup - all you need to do is alter zyzzyva57's formula in B12 to:
Code:
=IF(B10>20000,(IF(B10>50000,30000*H11,(B10-20000)*H11)),"")
If you want the cells to show nothing in them if there is no value, then change the 0 at the end of the formula in B13 to "" as in the code above.
If you want the cells to show $0.00 in them if there is no value, then change the "" at the end of the formula above to 0.