Simple VLookUp Formula for Excel
=VLOOKUP(C2,C5:D17,2,TRUE)
If you want to drag the formula cell below, first insert dollar sign between cell and row reference. So, the formula will be
=VLOOKUP(C2,$C$5:$D$17,2,TRUE)
You can be doing this by selection C5:D17
in formula and press F4 key.