Image 716 does not work because:-
1. You are looking for a value (15 in cell D1 that does not exist in range A
1 to B 5).
2. Your formula in cell F 1 appears to be wrong; it should be:-
=VLOOKUP(D1,A1:B5,2,FALSE)
With the above in cell F1 entry of any of 50 / 40 / 30 / 20 / 10 into cell
D1 will return the correct text in F1.
Please hit Yes if my comments have helped.
Thanks.