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February 21st, 2009, 10:54 AM  #1 
Newbie Joined: Feb 2009 Posts: 2 Thanks: 0  Can somebody help solve this problems please
A radio manufacturing firm has fixed cost of \$25.000 cost and variable cost of \$75.80 per radio. The radio sells for \$119.95. Write an expression for the profit function and find the number of radios that must be sold to break even. If money is invested at 9%, what is the effective annual rate if the investment is compounded a) quarterly? b) monthly? c) daily? d) countinuously? Last edited by skipjack; November 4th, 2016 at 07:04 AM. 
February 26th, 2009, 01:16 AM  #2 
Global Moderator Joined: Dec 2006 Posts: 20,642 Thanks: 2084 
Why are there three zeros in the fixed cost? Is it typed correctly? For the questions about interest rates, read this article. 
February 26th, 2009, 09:11 AM  #3 
Senior Member Joined: Sep 2008 Posts: 116 Thanks: 0  Re: CAN SOMEBODY HELP SOLVE THIS PROBLEMS PLEASE
If the zeros are correct and the fixed cost is just \$25.00, then you break even after the first radio because 119.95  25.000  75.80 = 19.15. Meaning you are making \$19.15 profit off the first radio sold. Now, assuming the fixed cost is supposed to be \$250.00, the formula becomes Because you can't sell .66 of a radio, round up to the nearest digit. So you need to sell 6 radios to start turning a profit. Total profit can be calculated with the function ************************************************** ************* ************************************************** ************* As for the second question, I could be wrong, but here it goes: Quarterly: Monthly: Daily: Countinuously: not sure how to do this one though You could do it with calculus though like The limit should also equal I believe, again, don't quote me on it though... Last edited by skipjack; November 4th, 2016 at 07:04 AM. 
April 2nd, 2009, 01:05 PM  #4 
Global Moderator Joined: Dec 2006 Posts: 20,642 Thanks: 2084 
That limit is 1e^0.09, but is the formula correct?


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