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Rakeem458
25.08.2019 •
Mathematics
Nico is saving money for his college education. he invests some money at 9% and $1400 less than that amount at 3%. the investments produced a total of $198 interest in 1 yr. how much did he invest at each rate?
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Ответ:
and y = the amount of money he invests at 3%
y = x - 1400
0.09x + 0.03y = 198
x - y = 1400
9x + 3y = 19800
3x - 3y = 4200
9x + 3y = 19800
12x = 24000
x = 2000
y = 600
$2000 invested at 9% interest
and $600 invested at 3% interest.
Ответ:
why you put your number on here ?