Mobistar is a mobile services company that sells 800
obile services company that sells 800 phones each week
when it charges $80 per phone. it sells 40 more phones per week for each
$2 decrease in price. the company's revenue is the product of the
number of phones sold and the price of each phone. what price should
the company charge to maximize its revenue?

The revenue of the company will be maximum when the price of each phone will be $60.

Step-by-step explanation:

The company charges $80 per phone and sells 800 phones each week .

Now, if the price of each phone is reduced by $2 then it sells 40 more phones per week.

Therefore, for $2x decrease in price the number of phones sold per week will be (800 + 40x)

Therefore, the revenue of the company will be given by the function

R(x) = (800 + 40x)(80 - 2x)

R(x) = 64000 - 1600x + 3200x - 80x²

R(x) = 64000 + 1600x - 80x² (1)

The condition for maximum revenue is R'(x) = 0

So, differentiating equation (1) with respect to x we get

R'(x) = 1600 - 160x = 0

⇒ x = 10

Therefore, the revenue of the company will be maximum when the price of each phone will be $(80 - 10 × 2) = $60 (Answer)

the answer is 489

step-by-step explanation:

the total estimated nappy use.=10,500,000

step-by-step explanation:

given that on an average the average baby uses 3528 napkins.

in a particular year 2014, the number of births were 299697 in new south wales.

rounding off the number of births to the nearest hundred thousand we have

no of birtsh = 300000

also rounding off the average usage to nearst thousand we get

average use of a baby = 3500

hence total number of nappy estimated to be used = 3500x300000

= 10,500,000

answer is 10,500,000 nappies