Question 1092962
I'll assume this is simple interest
{{{ I = P*r*t }}}
{{{ I = 6200 - 4000 }}}
{{{ I = 2200 }}}
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{{{ 2200 = 4000*r*10 }}}
{{{ r = 2200/40000 }}}
{{{ r = 22/400 }}}
{{{ r = 11/200 }}}
{{{ r = .055 }}}
{{{ .055*100 = 5.5 }}}
Annual rate  = 5.5%