Question

There are 24 boys and 20 girls in a chess club last year. This year the number of boys increased by 25% but the number of girls decreased by 10%. Find the overall percent change in membership of the club.

Answer 1

interesting..I need the asnwer also!

Answer 2

Will it be 30 boys?

Answer 3

yes

Answer 4

And how many girls?

Answer 5

And 22 girls?

Answer 6

you are subtracting 10 percent. no

Answer 7

Oh sorry 18 girls?

Answer 8

Yes, 18 geirls

Answer 9

So, you had last year: 44 people overall.
You have now: 48 people overall.

Answer 10

48-44/44 x 100?

Answer 11

yes, if you mean it as,

\(\large\color{slate}{ 100\times~~~~(48-44)/44 }\)

Answer 12

Yes.

Answer 13

your answer is?

Answer 14

about 9%

Answer 15

yes, correct.

Answer 16

Round your answer to whatever you need, a whole number, 1 tenth, or whatever the teach wants....

Answer 17

I have another question.

Answer 18

Sure,

Answer 19

Determine the length of time it will take to double a principal of $100 if deposited into an account that earns 10% simple annual interest.

Answer 20

+10% will be one year,
to double you need to make it +%100 (and +100%, will be in 10 years)

Answer 21

So with a +10% simple interest each year should be doubling the principal in 10 years regardless of what the principal amount is.

Answer 22

I don't really understand.

Answer 23

sure, so lets say you got any principal, call it 100. (To know that it is 100$ isn't important)

This entire principal is 100%.
To double the principal you need 200% (of the entire principal). (correct?)
You add 10% each year. (It is a simple interest of 10% so that is what you do)
To double you will have to add 100%.
In how many years will you add 100% percent?

Answer 24

10 years?

Answer 25

Yes

Answer 26

So it will take 10 yrs rights?

Answer 27

yes

Answer 28

Okay thx

Answer 29

If 1 year you add 10% more.
(So after year 1, you have 110% of the principal)

After 2 years you have added 20%
(So you have 120% of the principal)

and on...

After 10 years you have added 100%
(So you have 200% of the principal)

To have 200% of the principal, means double the principal.

Answer 30

yw