Question 4A man has $\$10{,}000$ to invest. He invests $\$4{,}000$ at $5\%$ and $\$3{,}500$ at $4\%.$ In order to have a yearly income of $\$500,$ he must invest the remainder at:$6\%$$6.1\%$$6.2\%$$6.3\%$$6.4\%$