00:01
In this problem of functions of several variables we have given that your measure online bookstore is in direct competition with amazon .com.
00:10
So these are your competitors.
00:12
First one is amazon .com then bn .com.
00:17
So this is bn .com and again this is your third and last competitor is borders .com.
00:24
So this is borders .com.
00:29
And your here revenue or your revenue.
00:33
You can say your company's daily revenue in dollars is given by say r is the function of x y and z and this is equals to 20 000 minus 0 .02 multiplied with x minus 0 .04 multiplied with y minus 0 .01 multiplied with z plus 0 .001 multiplied with y z here we can say x, y and z are the online daily revenues of amazon .com.
01:09
Say this is x .bn .com is daily revenue of bn .com is y and borders .com's daily revenue is given y is z.
01:17
Now we have given that.
01:18
On a certain day amazon .com shows revenue of $12 ,000.
01:22
That means x is equals to $12 ,000 and bn .com and borders .com each showing $5 ,000 of revenue...