Barbata invests $2400 in the National Bank at 5%. How much additional money must she invest at 10% so that the total annual income will be equal to 6% of her entire investment?
Pick one:
A) 120
B) 600
C) 1000
D) 360
E) 240
Let the additional invested amount for 10% interest be x;   Equation will be;   2400+0.05*2400+x+0.10x = 2400+x+0.06(2400+x)   0.05*2400+0.10x = 0.06x+0.06*2400   0.04x = 2400(0.06-0.05)   x = 2400*0.01/0.04= 
<gadget id="calculator">2400*0.01/0.04</gadget>
<output>600</output>
600   Ans:600
<result>B</result>
Barbata invests $2400 in the National Bank at 5%. How much additional money must she invest at 10% so that the total annual income will be equal to 6% of her entire investment?