In: Operations Management
With a fixed cost of $100 per order, Nathan decided it was vital to get his money's worth. His monthly demand for energy drinks was 10,000 bottles and holding cost was estimated at 20% of unit cost. The mail-order company offered him a couple of possibilities — he could pay $4.00 per bottle for orders of up to 10,000 bottles. After that threshold, he would pay only $3.98 per bottle, and if he ordered 20,000 or more bottles in a order, he would pay only $3.96 per bottle.
A. What is the best order quantity for Nathan to use?
B. What is the best total cost that Nathan can incur?
a) Best order quantity = 10000 (See table below) (Lowest cost)
b) Quantity of 10000 has the lowest cost of = Holding cost + order cost + product cost = (10000/2) *0.796+(120000/10000)*100+(120000*3.98) = $482780
Annual demand, D = Months * Monthly demand = | 120000 | ||
Order cost, S | 100 | ||
Quantity | 1 to 10000 | 10000 to below 20000 | 20000 or more |
Cost, C | 4.00 | 3.98 | 3.96 |
Holding cost, H = 20% | 0.80 | 0.796 | 0.792 |
EOQ = sqrt(2DS/H), | 5477.23 | 5490.97 | 5504.82 |
Considered Order quantity - Q for calculation | 5477.00 | 10000.00 | 20000 |
Considered Q = 5477 as EOQ is within range | Consider Q = 10000, for discount | Consider Q = 20000, for discount | |
Order size | 1 to 10000 | 10000 to below 20000 | 20000 or more |
Product cost = D (120000) * Respective cost for order quantity | 480000.00 | 477600.00 | 475200.00 |
Holding cost = (Q/2) * Holding cost | 2190.80 | 3980.00 | 7920.00 |
Ordering cost = (D/EOQ) * S | 2190.98 | 1200.00 | 600.00 |
Total cost | 484381.78 | 482780.00 | 483720.00 |