3 years ago

Can someone explain how to do percent of change example: what's the percent of markup from 25 to 35?

1 answer:

6 0

Answer:

35 is a 40% markup from 25.

Step-by-step explanation:

1) Find the markup. Subtract 25 from 35. The markup is 10.

2) Find the decimal fraction obtained by dividing this 10 by the original price (25): 10/25 = 0.4

3) Multiply this result by 100%: We get 40%.

35 is a 40% markup from 25.

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love history [14]

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SVEN [57.7K]

Actually, you have to find four missed terms of geometrical sequence. Denote

$a_1=25,\\ a_6=800$

and r - ratio, then

$a_2=a_1\cdot r=25r,\\a_3=a_1\cdot r^2=25r^2,\\a_4=a_1\cdot r^3=25r^3,\\a_5=a_1\cdot r^4=25r^4,\\a_6=a_1\cdot r^5=25r^5$ .

Since $a_6=800$ , you have that $800=25r^5$ , then

$r^5=\dfrac{800}{25} =32,\\r=2$ .

Now substitude r=2 in each of unknown 4 terms:

$a_2=25\cdot 2=50,\\a_3=25\cdot 2^2=100,\\a_4=25\cdot 2^3=200,\\a_5=25\cdot 2^4=400$ .

Answer: four geometric means between 25 and 800 are 50, 100, 200, 400.

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