Question 325534
An arithemetic sequence is an additive one. This means that each year an unknown amount "x" is added to each sequence. Between the 4th and 9th years, there are 5 sequences. Also, between the 4th and 9th years, there are 12850 RM. 

12850 / 5 = 2570 RM per year. Between the fourth and ninth years, you add 2570  to each year. Between the first and fourth years, you subtract 2570 to each year (you are going backwards, so it requires subtraction instead of division). 

therefore, the third year would be 38560 - 2570

the second year would be: 38560 - (2*2570)
The first year would be: 38560 - (3 * 2570) = 30850 RM

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