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January 30th, 2014, 12:08 PM  #1 
Newbie Joined: Jan 2014 Posts: 1 Thanks: 0  Marginal cost with two variables, confused.
Your weekly cost to manufacture x bicycles and y tricycles is C(x,y)=20,000+60x+20y+50?(xy) a. What is marginal cost of manufacturing a bicycle. I derived x and got (25y^1/2)/x^(1/2) +60 but I dont know what to do next or if that is even right. b. What is the marginal cost of manufacturing a tricycle. I derived y and got (25x^1/2)/(y^1/2) +20 again I dont know what to do next c. What is the marginal cost of manufacturing a bicycle at a level of 10 bicycles and 10 tricycles? d. What is the marginal cost of manufacturing a tricycle at a level of 8 bicycles and 8 tricycles? 
January 31st, 2014, 05:41 PM  #2  
Math Team Joined: Sep 2007 Posts: 2,409 Thanks: 6  Re: Marginal cost with two variables, confused.
I thought I had responded to this yesterday, but found it without a response this morning so repeated my response. Now I find no response again! Did I not post it right or did someone erase it or was this on three different boards? Quote:
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January 31st, 2014, 06:31 PM  #3 
Global Moderator Joined: Oct 2008 From: London, Ontario, Canada  The Forest City Posts: 7,968 Thanks: 1152 Math Focus: Elementary mathematics and beyond  Re: Marginal cost with two variables, confused.
@HallsofIvy: There's no record of such a deletion here (sitewide, from yesterday on).

February 1st, 2014, 04:18 AM  #4 
Math Team Joined: Sep 2007 Posts: 2,409 Thanks: 6  Re: Marginal cost with two variables, confused.
So, my mind is going! Knew it would happen sooner or later.


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