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alekssr [168]
3 years ago
8

Lafayette County has a population of 7022 people Columbia County population is 8 times as great as Lafayette County population w

hat is the population of Columbia County
Mathematics
1 answer:
Ber [7]3 years ago
3 0
     7022                          multiply ! !                            !
    *      8
  -----------
   61616
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$13,168is invested, part at 13%and the rest at
Kryger [21]

Answer: the amount invested at 13% is $9748

the amount invested at 5% is $3420

Step-by-step explanation:

Let x represent the amount invested at 13%.

Let y represent the amount invested at 5%.

$13,168 is invested, part at 13 % and the rest at 5%. This means that

x + y = 13168

The formula for determining simple interest is expressed as

I = PRT/100

Where

I represents interest paid on the loan.

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R represents interest rate

T represents the duration of the loan in years.

Considering the amount invested at 13%,

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T =1 year

I = (x × 13 × 1)/100 = 0.13x

Considering the amount invested at 5%,

P = y

R = 5%

T = 1 year

I = (x × 5 × 1)/100 = 0.05y

If the interest earned from the amount invested at

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5% by $1438.24, it means that

0.13x - 0.05y = 1438.24 - - -- - - - - -1

Substituting x = 13168 - y into equation 1, it becomes

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