Please calculate the ' re-ordering level' from the given particulars below.

Re-order level = Maximum consumption x maximum re-order period

Re-order level =1000*18 =18,000 units

Its Maximum consumption in maximum lead time i.e.1,000 *18 =18,000 units

agree with  Mir Mujtaba Ali 

thank you for invitiation 

Re-order level = Maximum consumption x maximum re-order period

Maximum consumption:1000 units

Maximum re-order period:18 days.

Re-order level=1000 X18 =18000 units

Max. consumptionXMax. period

1000unitsX18days=18,000 units

Good contribution by the experts, thanks for good answers

Thank you Sir for the invitation...Fully agreed with all experts.

18000 units

Re-order Level= Maximum Consumption x Maximum Re-ordering Period

R = y(optimal) over D (demand ) 

18 = y over1000

y =18000 (maximum level)

y =900 *15 =13500 ( min. level)

>>>>>>>>>>>>>>>>>18000 UNITS