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Bunuel
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80+20=100
in a year
80*1,07+?=100*3,5
cca. 86 + ? = 103,5
?=17,5
(17,5-20)/20= -2,5/20 =>cca 12% < 14% =>C
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I treat all weighted average questions as mixture questions. Hence,

7*80+20x=3.5*100
x=-210/20
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Bunuel
A real estate investment firm began the year with 80% of its investments in commercial real estate and 20% in residential real estate. Over the course of the year, the total value of its investments increased by 3.5%, with the value of its commercial real estate holdings growing by 7%. This means that the value of its residential real estate holdings:

A. Did not change
B. Decreased by 14%
C. Decreased by 10.5%
D. Decreased by 3.5%
E. Increased by 1.5%

Given: A real estate investment firm began the year with 80% of its investments in commercial real estate and 20% in residential real estate. Over the course of the year, the total value of its investments increased by 3.5%, with the value of its commercial real estate holdings growing by 7%.

Asked: This means that the value of its residential real estate holdings:

Let the value of its residential Real Estate holdings increase by x%
80% * 7% + 20% x = 3.5%
5.65% + .2x = 3.5%
.2x = 3.5% - 5.6% = -2.1%
x = - 10.5%
This means that the value of its residential real estate holdings decreased by 10.5%

IMO C
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