Question

Charmaine invested her savings in two investment funds. The $8000 that she invested in Fund A returned a 4% profit. The amount that she invested in Fund B returned a 1% profit. How much did she invest in Fund B, if both funds together returned a 3% profit?

Answer 1

In Fund A;

$\begin{gathered} \text{Amount Invested= \ 8000} \\ \text{Profit}=\text{ 4\%} \\ =\text{ 4\% of \ 8000} \\ =\text{ \ 320} \end{gathered}$

Also, in Fund B;

$\begin{gathered} \text{Let the amount invested be x;} \\ \text{Profit =1 \%} \\ =1\text{ \% of x} \\ =0.01x \end{gathered}$

Total funds, we have;

$\begin{gathered} \text{Amount invested= \ 8000+x} \\ \text{Profit}=\text{ 3 \%} \\ =3\text{ \% of (8000+x)} \\ =240+0.03x \end{gathered}$

Then, we can equate the total funds to the sum of invested in fund A and fund B;

$\begin{gathered} 320+0.01x=0.03x+240 \\ 0.03x-0.01x=320-240 \\ 0.02x=80 \\ x=\frac{80}{0.02} \\ x=\text{ \ 4,000} \end{gathered}$

The amount invested in Fund B is $4000.