Casandra invested one part of her 10,000 $a t$ 7.58.5 $820$ . How much did she invest at $7.5 %$ rate?

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Solution

Let part with $7.5$ per year investment be $x$ .
The other part be $10000 - x$
Her total income from the two investments are given by:
$x \frac{7.5}{100} + (10000 - x) \frac{8.5}{100} = 820$
$75 x + (850000 - 85 x) = 820000$
$10 x = (85 - 82) \times 10^{4}$
$x = 3 \times 10^{3}$
$3000$ $ was invested at $7.5 %$
$7000$ $ was invested at $8.5 %$

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Casandra invested one part of her 10,000at7.58.5 820. How much did she invest at 7.5% rate?

Let part with 7.5 per year investment be x.The other part be 10000−xHer total income from the two investments are given by:x7.5100+(10000−x)8.5100=82075x+(850000−85x)=82000010x=(85−82)×104x=3×1033000$ was invested at 7.5%7000$ was invested at 8.5%

Casandra invested one part of her 10,000 $a t$ 7.58.5 $820$ . How much did she invest at $7.5 %$ rate?