A company produces on an average 400 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 4375 items per month over the whole ?
Required average = `((4375 xx 12) - (4000 xx 3))/(9)`= `(52500 - 12000)/(9)` = `40500/9` = 4500.
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