Question 831847
This appears to be problem of simple interest,
not compound interest, so I will assume that
Let {{{ x }}} = the amount invested @ 2.5% interest
{{{ 2x }}} is the amount invested @ 4% interest
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given:
{{{ .025x + .04*2x = 1050 }}}
{{{ .025x + .08x = 1050 }}}
{{{ .105x = 1050 }}} 
{{{ x = 10000 }}}
and
{{{ 2x = 20000 }}}
$10.000 is invested @ 2.5% interest
$20,000 is invested @ 4% interest
check:
{{{ .025x + .08x = 1050 }}}
{{{ .025*10000 + .08*10000 = 1050 }}}
{{{ 250 + 800 = 1050 }}}
OK