Question 300960
Let {{{v}}} = stock's original value
{{{.8v}}} = stock's value minus 20%
Let {{{x/100}}} = percent that it must increase
given:
{{{(x/100)*(.8v) + .8v = v}}}
{{{.8v*(x/100 + 1) = v}}}
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{{{x/100 + 1 = 1/.8}}}
{{{x/100 = 1/.8 - 1}}}
{{{x/100 = 1.25 - 1}}}
{{{x = 100*.25}}}
{{{x = 25}}}
The stock must increase by 25%