Here's the question you clicked on:
soccergal12
Sarah's flower shop gets very busy on V-day, but they don't always sell out. Sarah knows that she can sell 50 rose bouquets at a price of $75 each, but she can sell 60 if she drops the price down to $65 each. (a) find the demand function p(x) .. assume it's linear. (b) find the revenue function R(x). (c) find for which value(s) of x the marginal revenue equals to 0 (d) suppose each bouquet costs Sarah $25 to make. find the marginal profit for x = 50. what does this value mean? I found the demand function : p(x) = -x + 125 And the Revenue function : R(x) = -x^2 + 125x and found the marginal revnue: x = 125/2 rose bouquets i don't get how to do part d
isnt it just R(50) - 25*50 ?
so it would be 2500 ?
yep if marginal profit is total revenue - cost of making it
im getting 7500 not 2500, double check your working
you should get 0. u still stuck ?
i got 7500, not zero. i put ((-50)^2 + 125(5)) - 25(50) in my calculator to get 7500.
i mean ((-50)^2 + 125(50)) - 25(50)
what you computing is overall profit. in the question they are asking about marginal profit right ?
yeah, it's asking for marginal profit
does that mean, it should be dP/dt = dR/dt - dC/dt ?
exactly.. you are correct. marginal something means, derivative something
okay, i used the original profit function: p(x) -x +125 to get the derivative: p^1(x) = -1 ; so from this function, we know that the marginal profit is zero ? because you cannot plug in 50 for x, because there is no x variable in the derivative?
dP/dt = dR/dt - dC/dt your above equation is right. just take: (derivative of REVENUE) - (derivative of COST) that comes like : d/dx { R(x) } - d/dx { 25x }
25x is you cost function