Suppose a college student buys a $3000 computer , the life span of the computer is 4 years, after which its value will be $200. The difference between $3000 and $200, or $2800 may be deducted from the students taxable income over a 4 year period. The sum of the years is computed by1+2+3+4 = 10. With this method, 4/10 of $2800 is deducted the first year and so on, until 1/10 is deducted the fourth year. Both depreciation methods yield a total deduction of 2800 over 4 years. Find an arithmetic sequence that gives the amount depreciated each year by each method. Write a series whose sum is the amount depreciated over 4 years by each method.