Mrs.Jackson has $7000 to invest. If she invests part at 6% simple annual interest and part at 8% simple annual interest, she will get an annual return of $520. How much should she invest at 8%?

Question

anonymous · Answer

I₁        +          I₂                =   $520
.08x    +   ( 7,000 -x) .06   =    $520

help!!!! · Answer

a.2500
b.3000
c.5000
d.2000

anonymous · Answer

@HELP!!!! I've already given sufficient help, now your turn to solve the equation to get the answer!

help!!!! · Answer

i got the answer 5000 but how did you figure out how to do the equation?

anonymous · Answer

Correct! The portion invest into 8% is $5,000

help!!!! · Answer

how did you figure out how to do the equation?

anonymous · Answer

Apply the Simple Interest formula I = P r t!

help!!!! · Answer

what does p mean?

help!!!! · Answer

price?

anonymous · Answer

Basing on the information " annual return of $520 " which is Sum of  I₁ + I₂ 
P means Principal:  P₁ + P₂   =  $7,000

anonymous · Answer

Since people familiar with x, so I use x instead of P₁