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12.03.2021 •
Mathematics
Ms.Robbins wants to carpet her living room floor which is pictured in the figure below. Carpet cost $22 per square foot and there is an installation fee of $250. How much will it cost Ms.Robbins to carpet her living room?
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Ответ:
$6,388
Step-by-step explanation:
Ответ:
53% increase
Work Shown:
A = old value = 4.25
B = new value = 6.50
C = percent change
C = 100*(B-A)/A
C = 100*(6.50 - 4.25)/4.25
C = 52.94%
C = 53%
notes:
The positive C value indicates we have a percent increase. If C was negative, then we'd have a percent decrease.
The formula shown above for C is basically having us compute the difference in price (B-A) and then we divide that difference over the original price A. This computes the decimal form of the answer. The "100*" tacked out front will convert from decimal to percent form.
If you took 52.94% of the original price 4.25, then you would get 0.5294*4.25 = 2.24995 which rounds to 2.25; this is the amount the price increases so we add this to 4.25 and we get 4.25+2.25 = 6.50 which is the new share price.