The inventory level at the end of each week can be calculated as follows:

Week	Demand	Inventory	Order Placed	Order Received
12	60	350	No	N/A
13	30	320	No	N/A
14	50	320	No	N/A
15	60	350	No	N/A
16	70	410	Yes	Week 18
17	50	380	No	N/A
18	60	410	No	N/A
19	50	380	No	N/A
20	30	350	No	N/A
21	40	310	Yes	Week 23
22	50	280	No	N/A
23	30	250	No	N/A
24	30	220	Yes	Week 26
25	40	240	No	N/A

The next order is made at the end of week  

The reorder point R is 240 units and the current inventory level at the end of week 14 is 320 units. Therefore, an order needs to be placed at the end of week 14 to bring the inventory level back up to the reorder point. The next order is made at the end of week 14.

 

 Looking at your solutions why there is answer that new order has been placed at the end  of week 14 and in table  it does not show that has been order places.  Instead it has been placed at week 16.

also when would you show when order has been received from week 9 order?