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Sagot :
let 'x' be the amount invested at 4.5%
'y' be the amount invested at 4%
Since you are provided that the total investments earned 525 then you'll have the equation as:
0.045x + 0.04y = 525 -----equation 1
You're given the total amount of 12,000 then
x + y = 12,000 -------equation 2
transposing x to the right side for equation 2
y = 12,000 - x ---------equation 3
substitute equation 3 to equation 1
0.045x + 0.04y = 525
0.045x + 0.04(12,000-x) = 525
0.045x + 480 - 0.04x = 525
0.045x - 0.04x = 525 - 480
0.005x = 45
x = 9,000
substitute the value of 'x' to equation 3
y = 12,000 - x
y = 12,000 - 9,000
y = 3,000
'y' be the amount invested at 4%
Since you are provided that the total investments earned 525 then you'll have the equation as:
0.045x + 0.04y = 525 -----equation 1
You're given the total amount of 12,000 then
x + y = 12,000 -------equation 2
transposing x to the right side for equation 2
y = 12,000 - x ---------equation 3
substitute equation 3 to equation 1
0.045x + 0.04y = 525
0.045x + 0.04(12,000-x) = 525
0.045x + 480 - 0.04x = 525
0.045x - 0.04x = 525 - 480
0.005x = 45
x = 9,000
substitute the value of 'x' to equation 3
y = 12,000 - x
y = 12,000 - 9,000
y = 3,000
Let x be the amount invested at 4.5%.
y be the amount invested at 4%.
Since you are provided that the total investments earned 525, then you'll have the equation as:
0.045x + 0.04y = 525
Total amount of 12,000 then:
x + y = 12,000
Transpose x to the right side:
y = 12,000 - x
Substitute equation 3 to equation 1
0.045x + 0.04y = 525
0.045x + 0.04(12,000-x) = 525
0.045x + 480 - 0.04x = 525
0.045x - 0.04x = 525 - 480
0.005x = 45
x = 9,000
Substitute the value of x to equation 3:
y = 12,000 - x
y = 12,000 - 9,000
y = 3,000
y be the amount invested at 4%.
Since you are provided that the total investments earned 525, then you'll have the equation as:
0.045x + 0.04y = 525
Total amount of 12,000 then:
x + y = 12,000
Transpose x to the right side:
y = 12,000 - x
Substitute equation 3 to equation 1
0.045x + 0.04y = 525
0.045x + 0.04(12,000-x) = 525
0.045x + 480 - 0.04x = 525
0.045x - 0.04x = 525 - 480
0.005x = 45
x = 9,000
Substitute the value of x to equation 3:
y = 12,000 - x
y = 12,000 - 9,000
y = 3,000
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