Exhibit 15.1 The Following Questions Employ the AON Network and Partial Spreadsheet

Multiple Choice

Exhibit 15.1
The following questions employ the AON network and partial spreadsheet below.
-What formula should go in cell I5 of the following spreadsheet to compute Actual Time Between Starts?

A) =VLOOKUP(H5,$B$5:$D$11,3) -VLOOKUP(G5,$B$5:$D$11,3)
B) =VLOOKUP(H5,$B$5:$D$11,2) -VLOOKUP(G5,$B$5:$D$11,2)
C) =VLOOKUP(G5,$B$5:$D$11,3) -VLOOKUP(H5,$B$5:$D$11,3)
D) =VLOOKUP(H5,$B$5:$D$11,3) -VLOOKUP(G5,$B$5:$D$11,2)