Barbata invests $2800 in the National Bank at 5%. How much additional money must she invest at 8% so that the total annual income will be equal to 6% of her entire investment?  Answers
A) 1200 B) 3000 C) 1000 D) 1400 E) 2400
Let the additional invested amount for 8% interest be x;   Equation will be;   2800+0.05*2800+x+0.08x = 2800+x+0.06(2800+x)   0.05*2800+0.08x = 0.06x+0.06*2800   0.02x = 2800(0.06-0.05)   x = 2800*0.01/0.02= 
<gadget id="calculator">2800*0.01/0.02</gadget>
<output>1_400</output>
1400   Ans: "1400"
<result>D</result>
Barbata invests $2800 in the National Bank at 5%. How much additional money must she invest at 8% so that the total annual income will be equal to 6% of her entire investment?