Solve the problem.Martin saves $2 on the first day of a 10-day period, $4 on the second day, and so on. For the next 10 days, he increases the amount saved by $4 each day (instead of $2 each day). How much will he have saved after 20 days?
A. $560
B. $520
C. $530
D. $540
Answer: C
Mathematics
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- 2 < 6
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Mathematics