A student wishes to accumulate \$100,000 in education fund at the end of 20 years. If he deposit \$1000+X in the fund at the end of each of the first 10 years and \$1000+2X in the fund of each of the second 10 years, find X if the fund earns 6\% effective per year.
Ans: \frac{100,000-1000s_{\bar{20}}}{s_{\bar{20}}+s_{\bar{10}}}
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