A company produces an average of 4000 items per month for

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A company produces an average of 4000 items per month for the first 3 months. How much items, it must produce on an average per month over the next 9 months to average 4375 items per month over the whole year?

Let average production of a company in 9 months be y items
∴ According to question,

4375 =	3 × 4000 + 9 × y
	12

⇒ 4375 × 12 = 12 × 1000 + 9 × y
∴ 9 × y = 12 (4375 – 1000) = 12 × 3375

∴ y =	12 × 3375
	9

y = 4500