Barbie invests $2400 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?
Choose the correct choice from the following answers: A) 1250 B) 3000 C) 1000 D) 3600 E) 1200
Let the additional invested amount for 8% interest be x;   1200quation will be;   2400+0.05*2400+x+0.08x = 2400+x+0.06(2400+x)   0.05*2400+0.08x = 0.06x+0.06*2400   0.02x = 2400(0.06-0.05)   x = 2400*0.01/0.02= 
<gadget id="calculator">2400*0.01/0.02</gadget>
<output>1_200</output>
1200   Ans:1200
<result>E</result>
Barbie invests $2400 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?