The manufacturer of an electronics product finds it necessary to keep a 10-day supply of memory chips on hand. The chips in his inventory were purchased at $5 per chip, but over the weekend, the price of these chips has increased to $6 per chip. Other materials costs for this electronics product are $3, and the labour costs for assembling the product are $4. What are the manufacturer’s variable costs for the products that he will be manufacturing during this coming week?单项选择题

A

$8

B

$9

C

$12

D

$10

E

$13

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