Help with the demand funtion when price is changing?

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yess

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A store is selling t-shirts at $40 per shirt and at this price customers have been buying 60 shirts per month. The owner estimates that for every $1 price increase, 3 fewer shirts will be sold. If the relationship between price per shirt and number sold is linear ...
a) find the demand function expressing price, p, in terms of shirts sold, x
b) find the total revenue R(x) in terms of shirts sold
 


Are you sure that they told you to let x = the number of shirts sold ?

I expected the independent variable to represent the number of $1 price increases.

shirt price = x + 40

demand = 60 - 3x

Revenue is (shirt price) times (demand).

Maybe, I'm wrong. :?

 
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