Kerry earned a total of $900 last year on his investments. If $7000 was invested at a certain rate of return and $9000 was invested in a fund with a rate that was 2% higher, find the two rates of interest.

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## Finding Rates of Interest on Investments

Kerry earned a total of $900 last year on his investments. If $7000 was invested at a certain rate of return and $9000 was invested in a fund with a rate that was 2% higher, we need to find the two rates of interest.

Given:
- Total earnings from investments: $900
- Amount invested at a certain rate: $7000
- Amount invested at a rate 2% higher: $9000

Let \( x \) be the rate of interest at which $7000 is invested and \( x+2 \) be the rate of interest at which $9000 is invested.

This implies:
\[ \frac{7000 \cdot x}{100} + \frac{9000 \cdot (x+2)}{100} = 900 \]

Simplifying the equation:
\[ 70x + 90x + 180 = 900 \]
\[ 160x = 900 - 180 \]
\[ 160x = 720 \]
\[ x = \frac{720}{160} \]
\[ x = \frac{9}{2} \]
\[ x = 4.5 \]

This means:
- $7000 was invested at a 4.5% rate of interest.
- $9000 was invested at \( x + 2 = 4.5 + 2 = 6.5 \%\) rate of interest.
Transcribed Image Text:## Finding Rates of Interest on Investments Kerry earned a total of $900 last year on his investments. If $7000 was invested at a certain rate of return and $9000 was invested in a fund with a rate that was 2% higher, we need to find the two rates of interest. Given: - Total earnings from investments: $900 - Amount invested at a certain rate: $7000 - Amount invested at a rate 2% higher: $9000 Let \( x \) be the rate of interest at which $7000 is invested and \( x+2 \) be the rate of interest at which $9000 is invested. This implies: \[ \frac{7000 \cdot x}{100} + \frac{9000 \cdot (x+2)}{100} = 900 \] Simplifying the equation: \[ 70x + 90x + 180 = 900 \] \[ 160x = 900 - 180 \] \[ 160x = 720 \] \[ x = \frac{720}{160} \] \[ x = \frac{9}{2} \] \[ x = 4.5 \] This means: - $7000 was invested at a 4.5% rate of interest. - $9000 was invested at \( x + 2 = 4.5 + 2 = 6.5 \%\) rate of interest.
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