Using If cell contains N A as a formula condition

Question

I need help with my Excel sheet. How can I declare the following IF condition properly?

if A1 = "n/a" then C1 = B1
else if A1 != "n/a" or has value(int) then C1 = A1*B1

Answer 1

Input the following formula in C1:

=IF(ISNA(A1),B1,A1*B1)

Screenshots:

When #N/A:

When not #N/A:

I hope this helps you.