Antonio has found that he can input statistical data into his computer at the rate of 2 data items faster each half hour he works. One Monday, he starts work at 9:00A.M., inputting data at a rate of 3 data items per minute. At what rate will Antonio be inputting data into the computer by lunchtime (noon)?
Answer
A
12 data items per minute
B
15 data items per minute
C
21 data items per minute
D
24 data items per minute
Explanation
From 9:00 A.M. to noon is 3 hours, or six half-hour periods. Antonio’s rate increases by 2 data items per minute in each period, so it increases by 6 × 2 = 12. Adding that to his starting rate of 3 gives 15 data items per minute, choice b.
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