Question 227754
{{{ 1000=681.2(1+z/2)^10 }}}
{{{(1+x/2)^10 = 1000/681.2}}}
{{{1 + x/2 = (1000/681.2)^(1/10)}}}
{{{x/2 = -1 + (1000/681.2)^(1/10)}}}
{{{x = -2 + 2*(1000/681.2)^(1/10)}}}
x = ~ 0.0782727