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rianna14
04.08.2019 •
Mathematics
Iwon $60,000 i invested part in a cd at 2% interest the rest at 3%interest in a cd at the end of the year i earned $1600 in interest. how much did i invest in each cd
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Ответ:
At 3% int: i3 = (60000-x) * 0.03 is the amt of interest earned.
Note that i2 + i3 = $1600, and that x + y = 60000.
x * 0.02 + (60000-x) * 0.03 = $1600 can be solved for x, the amt invested at 2%.
0.02x + 1800 - 0.03x = 1600 simplifies to $200 = 0.01x. Thus, x = $20000 at 2% and y = 60000-20000 = $40000 at 3%.
Ответ: