Many people were worried when they found that their photocopiers had been sometimes changing numbers; one photocopier sometimes, although not always, changed 6 into 8.A list of prices was copied on this photocopier. The first five prices on the copy·are shown below.$54.80$60.00$65.40$70.80$78.20In the original list, the prices had increased by the same amount each time. What was the next price.on the original list?
Correct answer: A. $81.60
- A. $81.60
- B. $81.80
- C. $83.60
- D. $85.60
Explanation
Since the photocopiers change the 6s to 8s, we can assume that the first price is $54.60 instead of $54.80, the third price is actually $65.40 instead of $85.40, and the fifth price is $76.20 instead of $78.20. Doing this means that we now have a consistent increase in prices of $5.40.With that, we can make our own copy of the original list:$54.60$60.00$65.40$70.80$76.20With another consistent price increase of $5.40, the next price on the original list = $76.20+$5.40=$81.60Therefore, the answer is A.
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Series questions use numbers, letters, symbols or combinations arranged according to a hidden pattern. You may need to identify repeated operations, alternating rules, alphabetical positions, differences, reversals and mixed sequences to find a missing term or predict the next one.
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