Barbata invests $2400 in the National Bank at 4%. How much additional money must she invest at 8% so that the total annual income will be equal to 6% of her entire investment?	Select:
A) 1200 B) 3000 C) 2400 D) 3600 E) 2450
Let the additional invested amount for 8% interest be x;   Equation will be;   2400+0.04*2400+x+0.08x = 2400+x+0.06(2400+x)   0.04*2400+0.08x = 0.06x+0.06*2400   0.02x = 2400(0.06-0.04)   x = 2400*0.02/0.02= 
<gadget id="calculator">2400*0.02/0.02</gadget>
<output>2_400</output>
2400   Ans:2400
<result>C</result>
Barbata invests $2400 in the National Bank at 4%. How much additional money must she invest at 8% so that the total annual income will be equal to 6% of her entire investment?