Solve the problem.Martin saves $5 on the first day of a 40-day period, $10 on the second day, and so on. For the next 40 days, he increases the amount saved by $10 each day (instead of $5 each day). How much will he have saved after 80 days?
A. $20,600
B. $20,300
C. $20,200
D. $20,400
Answer: B
Mathematics
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A. - 
, - 
B. 
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C. - 
, - 
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B. 
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