lolirdc
18.03.2021 •
Mathematics
QUD circumscribes ⊙C . QU=18, UD=11, QD=19
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Ответ:
Ответ:
she invested x amount at 10%, so 0.10x
she then invested 30,000 - x qt 7%, so 0.7(3-x)
they both earned 2400:
0.10x + 0.07(3-x) = 2400
now solve for x:
0.10x + 2100 - 0.07x = 2400
combine like terms:
0.03x + 2100 = 2400
subtract 2100 from both sides:
0.03x = 300
divide both sides by 0.03:
x = 300 / 0.03
x = 10,000
she invested $10,000 at 10% and $20,000 at 7%