How often should standard costs get updated?
 
Do I have to manually update IN-L-A each time we make a purchase?  
Is there not someway it is automatically updated?
 
Should my standard cost always reflect the last purchase and its respective freight cost.  
If last week we bought a 100 lbs at 2.13 per pound and frt is  .10 per pound then the standard cost was $2.23 per pound.
But yesterday I bought a 100 lbs at 2.2o per pound and frt is  .11 per pound now the standard cost is $2.32 per pound.
 
If I have to do it manually thru IN-L-A .... do I need to do it with each purchase?
 
Thanks,
Laura