Barbata 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 8% of her entire investment?	Answers:
A) 1200	B) 3000	C) 1000	D) 3600	E) 2400
Let the additional invested amount for 8% interest be x;   Equation will be;   2400+0.05*2400+x+0.08x = 2400+x+0.08(2400+x)   0.05*2400+0.08x = 0.06x+0.08*2400   0.02x = 2400(0.08-0.05)   x = 2400*0.03/0.02= 
<gadget id="calculator">2400*0.03/0.02</gadget>
<output>3_600</output>
3600   Ans:3600
<result>D</result>
Barbata 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 8% of her entire investment?