O’s cоffee is а cаmpus cоffee stоre. O’s coffee uses 840 bаgs of whole bean coffee every year. O’s coffee has signed a year-long contract to purchase its coffee from a local supplier, Phish Roaster, for a price of $25 per bag and a $120 fixed cost for every delivery independent of the order size. The coffee beans can be delivered immediately after an order is placed. The holding cost per bag per month is $3. What is the optimal order size in bags? (Find the closest answer)