same as the other one
part A)
CD 12,000 at 6%, how much is that? (6/100) * 12000
CB 4000 at 5%, how much is that? (5/100) * 4000
part B)
total investment was 12000 + 4000 = 16000
the earned interest above are 720 and 200 respectively
total yield was, 720 + 200 = 920
if 16000 is the 100%, how much is 920 in percentage?
[tex]\bf \begin{array}{ccllll}
amount&\%\\
\text{\textemdash\textemdash\textemdash}&\text{\textemdash\textemdash\textemdash}\\
16000&100\\
920&x
\end{array}\implies \cfrac{16000}{920}=\cfrac{100}{x}[/tex]
solve for "x"