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October 29th, 2018, 06:58 AM  #1 
Member Joined: Feb 2018 From: England Posts: 61 Thanks: 0  Formula.
Hi all, The objective is to minimise the actual cost of C of the support rod. The material supplier can only provide the price per unit volume Pv of the material chosen. Show that the objective equation is given by C = PvAL Derive an equation linking the actual cost of the material used to the price per unit volume provided by the supplier. Any suggestions on how best to tackle? Thanks. 
October 29th, 2018, 09:40 AM  #2 
Banned Camp Joined: Mar 2015 From: New Jersey Posts: 1,720 Thanks: 126 
Cost is a function of volume v purchased, and price per unit volume p(v) Minimize C=p(v)v subject to v>V=AL. C'=p'(v)v+p(v)=0 You would need p(v). Find v and ck v>AL 
October 30th, 2018, 01:53 AM  #3 
Member Joined: Feb 2018 From: England Posts: 61 Thanks: 0 
Thanks for your help Zylo.

October 30th, 2018, 10:55 AM  #4 
Banned Camp Joined: Mar 2015 From: New Jersey Posts: 1,720 Thanks: 126  

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