问题详情

Ajewellerycompanymakesrings(R)andnecklaces(N).
Theresourcesavailabletothecompanyhavebeenanalysedandtwoconstraintshavebeenidentified:
Labourtime3R+2N≤2,400hours
Machinetime0·5R+0·4N≤410hours
ThemanagementaccountanthasusedlinearprogrammingtodeterminethatR=500andN=400.
Whichofthefollowingis/areslackresources？
(1)Labourtimeavailable
(2)Machinetimeavailable
A.1only
B.2only
C.Both1and2
D.Neither1nor2

请帮忙给出正确答案和分析，谢谢！