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Sagot :
Answer:
$550 was invested in the 4% account while $700 was invested in the 7% account
Step-by-step explanation:
Let the amount invested in each account be $x and $y respectively
The sum of these two is $1,250
Mathematically;
x + y = 1250 •••••(i)
Now, let’s work with the interest rate;
4% of x + 7% of y = 71
4x/100 + 7y/100 = 71
Multiply through by 100
4x + 7y = 7100 •••••(ii)
From i;
x = 1250-y
Substitute this into ii
4(1250-y) + 7y = 7100
5000 - 4y + 7y = 7100
3y = 7100-5000
3y = 2100
y = 2100/3
y = 700
Recall;
x + y = 1250
700 + x = 1250
x = 1250 - 700
x = 550
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