An error occurred in your bookkeeping department this month. The price of one of the smart phones th

Mathematics
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How many phones were sold at the wrong price?

Sep 12th, 2015

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Sep 12th, 2015

I am new to this, I submitted the question again placed in the correct order, any help will be appreciated. Thank you.


Sep 12th, 2015

Its okay it will be answered. you can post one more here I can assist

Sep 12th, 2015

How many phones were sold at the wrong price?

An error occurred in your bookkeeping department this month. The price of one of the smart phones that you sell is $489. Several customers were charged $565 for the phone instead. You know that the total sales for this month were $213,873 and that 401 phones were sold.

Sep 12th, 2015

let the number OF PHONES SOLD AT wrong price (565) be x

let the phones sold at the right price be Y

x+y= 401

y=401-x

565x+ 489 y= 213873

565x +489(401-x) =213873

565x +196089 -489x  =213873

565x-489x= 213873-196089

76 x=17784

x=17784/76

x=234


Sep 12th, 2015

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