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Mathematics 18 Online
OpenStudy (rebeccapink6398):

@MelissaHolmes plz help :D I don't get this :( Wait so I have another question.. Kyle paid $96 in interest to borrow $7200 for 4 months. What annual interest rate did Kyle pay? A. 1.33% B. 4% C. 5.33% D. 16% so would I take the $7200*..? and that's where im stuck

OpenStudy (anonymous):

ok... so you would change 96 into a percent and multiply it by the $7200

OpenStudy (rebeccapink6398):

how do I change it into a percent??

OpenStudy (anonymous):

if you had .6 and changed it to a percent... it would be 60... so basically to change it to percent multiply by 100

OpenStudy (rebeccapink6398):

..I still don't get it..

OpenStudy (anonymous):

hang on... is there a specific formula for interest rate that you are supposed to use?

OpenStudy (rebeccapink6398):

I don't know what that means but there is the question.. Kyle paid $96 in interest to borrow $7200 for 4 months. What annual interest rate did Kyle pay? A. 1.33% B. 4% C. 5.33% D. 16%

OpenStudy (anonymous):

ok, give me a sec then... trying to solve...

OpenStudy (anonymous):

so your interest formula is I = PRT

OpenStudy (anonymous):

Interest is I Principal is P R is rate --> you're trying to solve for this and T is time

OpenStudy (rebeccapink6398):

ok :D

OpenStudy (anonymous):

so 96 is your interest 72000 is your principal and 4 months is your time

OpenStudy (anonymous):

*7200

OpenStudy (anonymous):

so plug the values into the formula: 96 = 7200(r)(4)

OpenStudy (rebeccapink6398):

???

OpenStudy (anonymous):

now you can solve for r: 96 = 7200*4*r 96 = 28800*r 96/28800 = r .0366 = 3

OpenStudy (anonymous):

that's rounds to .04 which is 4%

OpenStudy (anonymous):

do you get it?

OpenStudy (rebeccapink6398):

no..not at all..

OpenStudy (anonymous):

ok... so where do you not understand?

OpenStudy (rebeccapink6398):

I don't understand any of it...at all

OpenStudy (rebeccapink6398):

well..i get this! "so 96 is your interest 72000 is your principal and 4 months is your time"

OpenStudy (rebeccapink6398):

7200*

OpenStudy (anonymous):

ok... so yeah. then I plugged the values into your formula I = PRT

OpenStudy (anonymous):

the 96 for I the 7200 for P and 4 for T

OpenStudy (anonymous):

okay so far?

OpenStudy (anonymous):

maybe.... idk about my teaching skills...

OpenStudy (anonymous):

ok... i'll go on... tell me when I've lost you, k?

OpenStudy (rebeccapink6398):

ok :D

OpenStudy (anonymous):

so I got the 96 = 7200(r)(4) by plugging the values into the equation

OpenStudy (anonymous):

then: do you know how to solve for variables?

OpenStudy (rebeccapink6398):

wait so 96=interest 7200= principle..=what is that? and 4= the time ________________________________ No I dont

OpenStudy (anonymous):

Principle is the total cost; in this case 7200

OpenStudy (rebeccapink6398):

OH OK! :D

OpenStudy (rebeccapink6398):

oops sorry cap lock lol

OpenStudy (anonymous):

its ok :D

OpenStudy (anonymous):

anyway: you don't know how to solve for variables? like x and y?

OpenStudy (rebeccapink6398):

no...wait...kinda!! like 2+x=5 so x would be 3?! Like that?? I kinda know that

OpenStudy (anonymous):

yeah! like that...

OpenStudy (anonymous):

so, basically, you do the opposite operation when solving; like it there is addition, you do subtraction, if there is multiplication you do division....

OpenStudy (rebeccapink6398):

:D

OpenStudy (anonymous):

96 = 7200*4*r --> this is the equation with multiplication signs 96 = 28800*r --> it would be easier to simplify before solving (so 7200 *4) 96/28800 = r --> now the previous operation was multiplication; so you divide .0366 = r --> the division results in this

OpenStudy (anonymous):

got that?

OpenStudy (anonymous):

"r" is the thing you are solving for... the question is "what is the rate" and r is for rate

OpenStudy (anonymous):

the r is basically kinda like x in an equation; you solve for r.

OpenStudy (rebeccapink6398):

OH! ok!

OpenStudy (anonymous):

ok, so you understand it now, right?

OpenStudy (rebeccapink6398):

nope..not at all.. :(

OpenStudy (anonymous):

ok... what do you not understand?

OpenStudy (rebeccapink6398):

nvm its ok ill just ask someone else i have already wasted enof of ur time

OpenStudy (anonymous):

ok, i hope I was at least sorta helpful :D

OpenStudy (rebeccapink6398):

yes! vary much! :D

OpenStudy (anonymous):

ok! good! :D

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