Question 833916
Lasting 10 years means that it is no good after 
10 years and is therefore worthless.
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In order to go form $450  to $0 ion 10 years,
it loses {{{ 450/10 = 45 }}} dollars/year
{{{ 6.5*45 = 292.5 }}}
{{{ 450 - 292.5 = 157.5 }}}
In 6.5 years, it is worth $157.50