Zach borrowed four thousand dollars from his grandfather to buy a used car so he could travel to and from work. After working for 3 years, he has saved five thousand nine hundred twenty dollars to pay back to his grandfather. At what interest rate did Zach borrow the money?

- anonymous

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- apoorvk

i am assuming simple interest as you havent mentioned anything
now principal amount=P=4000
rate of interest per annum=R=?
t=no. of years borrowed for=3
now he is paying an interest of "I'=total final amount-borrowed principal= 1900
now I=(P x R x t)/100
1900=(4000x R x 3)/100
solve, you should get the rate of interest per annum. multiply by 100 to get interest %age.

- LifeIsADangerousGame

I agree.^

- anonymous

lol life

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## More answers

- anonymous

what does that equal btw

- LifeIsADangerousGame

Whatever it should equal.

- apoorvk

LOL

- anonymous

i need help again

- LifeIsADangerousGame

Well it's true!

- anonymous

with? what@jack

- anonymous

understanding this guys answer...its right but what is the percentage

- anonymous

ooh a medal...thanks@life and jack

- LifeIsADangerousGame

Cuz I'm awesome like that...Jack you need to figure out the answer Lazy Doctors now! Humph. I'll never go into surgery with you around! You might be too lazy to figure out if I need my lungs!

- anonymous

HAHAHAHAHAhah

- anonymous

u dont need your lungs id be happy to remove them heh heh heh

- LifeIsADangerousGame

I'm pretty sure I need all 4 humph.

- anonymous

werewolf trash

- anonymous

LMAO

- LifeIsADangerousGame

Dog poop!

- anonymous

hairball

- LifeIsADangerousGame

Buttbreath!

- anonymous

WOW

- anonymous

buttbreath? thats pretty serious

- anonymous

your the dog not me

- anonymous

thats biskerz your lookin at

- LifeIsADangerousGame

YOU JUTS SAID HAIR BALL! CATS get hairballs!

- anonymous

werewolfs get em too

- LifeIsADangerousGame

So does your dog HAHAHA

- anonymous

no he doesnt take it back

- LifeIsADangerousGame

NEVERRR

- anonymous

i hate u your not my fan anymore u insulted my cute dog

- LifeIsADangerousGame

You insulted my werewolf lineage!

- anonymous

im sorry

- LifeIsADangerousGame

ME too
cabbagebrain..

- anonymous

what ever

- LifeIsADangerousGame

I have several bees nest in my yard.

- anonymous

i gtg

- anonymous

bye jack

- LifeIsADangerousGame

bye!

- anonymous

no more fighting now

- anonymous

Simple Interest formula: I = p r t <=> r = I/ p * t
The difference amount between borrowed and paid back is the interest:
I = $5,920 - $4,000 = $1,920
=> Interest rate: r = 1,920 / 4,000 * 3 = .16 = 16%

- anonymous

i remember this from chat almost a month ago

- anonymous

XD that was amazing, and whats even better at the end the answer was there "16%"

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