Each day at Dan’s new job, he earns $10 more than the day before. If he just completed his 15th day of work, how much

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Each day at Dan’s new job, he earns $10 more than the day before. If he just completed his 15th day of work, how much did he earn on his first day?

(1) His total earnings for the three most recent workdays equal $690.

(2) His total earnings for the three most recent workdays exceed his total earnings for the first three workdays by $360.

Answer: A

Source: Manhattan GMAT
Source: — Data Sufficiency |