A company produces on an average 4000 items per month for the first 3 months. How many items it must produce on an average per month over the next 9 months, to average of 4375 items per month over the whole?	Choose one: A) 4500 B) 4600 C) 4680 D) 4710 E) None
Sol.   Required average = (4375 x 12) - (4000 x 3 ) / 9   ⇔ 52500 - 12000 / 9   ⇔   40500 / 9= 
<gadget id="calculator">  40500 / 9</gadget>
<output>4_500</output>
4500.   4500nswer 4500
<result>A</result>
A company produces on an average 4000 items per month for the first 3 months. How many items it must produce on an average per month over the next 9 months, to average of 4375 items per month over the whole?