The AND operator compares the results of two complete logical expressions:
IF logical expression 1 is true AND logical expression 2 is true THEN DO something;
In your code, expression 1 (sales>=100000) is OK, but expression 2 (>=200000) is incomplete, hence the error:
if sales>=100000 AND <=200000
You need to specify what value should be checked to see if it is less than 200000. Try this:
if sales>=100000 AND sales <=200000
That should work better.
May the SAS be with you!
Mark