The question is in description

Question

Ed Moura has

​$42000

invested in stocks paying

8​%.

How much additional money should he invest in certificates of deposit paying

3​%

so that the average return on the two investments is

4​%?

Answer 1

x= amount invested at 3%

.08(42000) + .03x = .04(42000+x)

3360 + .03x = 1680 + .04x

1680 = 0.01x

x=$168,000

$168,000 should be invested at 3% so the total $210,000 earning 4% equals the income from the two investments