Question

In the spring, the height of a vine was 25 inches. In the fall, the height of the vine was 140 inches. What was the percent of increase?

46%
56%
460%
560%

I need to ace this test and get my grade up! Thanks for the help if u can!

Answer 1

Would the answer be 46%?

Answer 2

what do you get for change= end height - start height?

Answer 3

115 = 140 - 25

Answer 4

and what fraction do you get doing
change/start
?

Answer 5

115/25 = 4.6 ?

Answer 6

yes, an "improper fraction" because it's bigger than 1.
but that's ok.
finally, how do you change fraction to a percent ?
multiply by 100 and add a % sign to the end

Answer 7

0.046 ???

Answer 8

you divided. you want to multiply.
example:
1/2 = 0.5
multiply by 100 to get 50 (and add %) to get 50%
1/2 is 50%

Answer 9

no 460% ?

Answer 10

so 460% right?

Answer 11

if you get confused about divide/multiply think:
fraction = x/100
so (multiply both sides by 100)
100*fraction = x

if that makes sense??

but yes, 460%

Answer 12

yes

Answer 13

Thank you! Okay here is a second question.
What is 0.1% written as a decimal?

Answer 14

or if you get confused, do a simple problem. You know
1/2 = 50% = 50 /100
also 1/2 = 0.5
so it's common sense that to get from 0.5 to 50, you multiply by 100

Answer 15

Ok awesome thanks

Answer 16

x% means (by definition) x/100

Answer 17

so rewrite 0.1% as 0.1 divided by ?

Answer 18

wait i think i figured it out. would the answer be 0.001?

Answer 19

yes. you could say
0.1% is 0.1/100
you can use a calculator, or you can say
.1 is 1/10
so .1/100 is 1/10 * 1/100 = 1/1000
and hopefully you can write that as 0.001

Answer 20

twenty is what percent of 400?
my answer would be 80%. this is correct right?

Answer 21

20 out of 400?
write it as a fraction

Answer 22

wait no! it would be 5% hahahhaa

Answer 23

yes. It helps to think about "real world"
somebody owes you $400. they give you $20 and say they paid you 80%. would you believe them ?

Answer 24

right. thanks.
Heres the last one!
Ruiz invests $550 at a simple interest rate of 4%. How much interest will he earn after 5 years?

Answer 25

any idea what's 4% of 550 ?

Answer 26

change 4% to a fraction, and multiply that fraction times 550

Answer 27

4% means 4 per cent which is Latin for 4 per 100

Answer 28

or 4 out of 100

Answer 29

if you can figure out 4% of 550, that is the interest you get for 1 year
multiply by 5 to get how much interest for 5 years.

Answer 30

okay. would the answer be $110 ?

Answer 31

what's 4% of 550 ?

Answer 32

22?

Answer 33

yes. that is the interest for 1 year (4% per year)
now multiply by 5 to get the interest for 5 years

Answer 34

and so 22 x 5 is 110

Answer 35

yes. It looks like 110 is the answer.

Answer 36

good job

Answer 37

Formula for simple interest:

\(\Large I = Prt\)

\(\large Where:\\\

I =~ interest\\\
P = ~amount ~borrowed~ (called~ "Principal")\\\
r =~ interest~ rate\\\
t =~time
\)

just in case you wanted to know the formula for it :)

Answer 38

Thanks!!

Answer 39

i aced my test. thanks guys!

Answer 40

also note that r has to be in decimal and t is in years.

Answer 41

O_O test?

Answer 42

Ummm. Did you know that OS has an anti-cheating policy?

Answer 43

And that your school has an honor code?

Answer 44

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Answer 45

lol pre test ! it just has similar questions to the actual test

Answer 46

oh lol

Answer 47

haha yeah i wouldn't cheat

Answer 48

Well anyhoot @bean73

\(\bf\huge\color{#ff0000}{W}\color{#ff2000}{e}\color{#ff4000}{l}\color{#ff5f00}{c}\color{#ff7f00}{o}\color{#ffaa00}{m}\color{#ffd400}{e}~\color{#bfff00}{t}\color{#80ff00}{o}~\color{#00ff00}{O}\color{#00ff40}{p}\color{#00ff80}{e}\color{#00ffbf}{n}\color{#00ffff}{S}\color{#00aaff}{t}\color{#0055ff}{u}\color{#0000ff}{d}\color{#2300ff}{y}\color{#4600ff}{!}\color{#6800ff}{!}\color{#8b00ff}{!}\\\small\cal Made~by~@TheSmartOne\)

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Answer 49

Hmm. @satellite73 could become your best friend.. jk
You know 73 73?
Not a funny joke? lol ok then :)