Question 990685
 For these problems, x will represent the number of items and y will represent the money. 
The fixed costs for a certain item are $100 per week. The cost to produce each item is $3 per item. 
Using this information, what is the cost equation? Give your answer in slope-intercept form: 
y = 3X+100  (Cost to produce "x" items)
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The retailer intends to sell each item for $10/item. 
Using this information, what is the revenue equation? 
Give your answer in slope-intercept form: 
y = 10X (Revenue)
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If in this week 9 items are made, and all items are sold in the week, what are the total costs to the retailer? 
Cost = 10*9 + 100 = $190.00
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What is the revenue from selling 9 items? 
Revenue = $90.00 

Finally, what is the profit for this retailer? (This is the part i can't figure out)
Profit = Revenue - Cost
Note:: Based on what you have posted, the retailer LOST money.
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Please check your post.

Cheers,
Stan H.