Question 128201
The formula is:
{{{A = P*(1 + (r/n))^(nt)}}}
{{{P}}} is the initial investment
{{{A}}} is the amount after {{{t}}} years
{{{n}}} is the number of times 
per year interest is compounded
{{{t}}} is the number of years invested
{{{2273.11 = P*(1 + (.04/2))^(2*2)}}}
{{{2273.11 = P*(1.02)^4}}}
{{{P = 2273.11 / 1.08243}}}
{{{P = 2100}}}
Her initial investment was $2,100