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Bunuel
Batteries are sold in boxes of 74 for $17.40 and in boxes of 37 for $12.40. A customer who needed only 74 batteries for a project had to buy 2 boxes of 37 because boxes of 74 were unavailable. Approximately, how much more did the customer pay for each battery due to the unavailability of the larger boxes?

A. $0.10
B. $0.24
C. $0.30
D. $0.34
E. $0.40

Since the question gives very exact numbers, we'll go for an exact calculation.
This is a Precise approach.

The average price of a battery in the boxes of 74 is 17.4/74.
We'll defer calculation for a moment as it looks messy...
The average price of a battery in the boxes of 37 is 12.4/37 = 24.8/74.

Therefore, our customer bought a total of 74 batteries at a price of 24.8/74 per battery for a total of $24.8
This was instead of buying 74 batteries at a price of 17.4/74 per battery for a total of $17.4
In total, our customer paid an extra 24.8 - 17.4 = $7.4 This gives 7.4/74 = $0.1 per battery.

(A) is our answer.
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