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Mr. Mensah started a job with an annual salary of $6400, which increased by $240 every year. After working for 8 years, Mr. Mensah is promoted to a new post with an annual income salary of $19,500, which increases by $360 every year.
1. Find his salary for his 15th year of service.
2. Find his total earnings at the end of the 15th year of service.