Pre calculus word problem please help?

Question

I love you relative invested 56000 dollars. They invested some of the money in account A that yielded 3% simple interest, some of the money in account B that yielded 3.5% simple interest, and the remainder in account C that yielded 4% simple interest. Your relative said the total interest earned from three investments for one year was 2020 dollars. Your relative also said the amount invested at 4% was twice the amount invested at 3%. Can you determine how much your relative invested in each of the three accounts? 

Also it says write system and write augmented matrix

Can you please help me out this is from a study guide and I'm expecting something similar on my test coming up

J7269 · Accepted Answer

Soo you love me?

Raffaele · Answer

A at 3% = 0.03
B at 3.5% = 0.035
C at 4% = 0.04

A + B + C = 56000
0.03A + 0.035B + 0.04C = 2020
C = 2A

A = 12,000 
B = 20,000 
C = 24,000

1,      1,        1,        | 56000
0.03, 0.035, 0.04,   | 2020
2,      0,        -1,       | 0

Anonymous · Answer

you will desire to have 15(.4)L of water =6 L in a answer of 40% to have 6L of water you decide on 6/.6 = 10 L of answer so which you would be wanting to drain 5L of answer it relatively is 40% and upload 5 L of organic antifreeze and the main suitable answer would have 6 L of water plus 9 L of antifreeze that provide as a answer of 60% of antifreeze

w · Answer

You know that
C=2A, so
.03A+.035B+2A.04=2020
.03A+.035B+A.08=2020
.11A+.035B=2020

And
A+B+2A=56000
3A+B=56000

Anonymous · Answer

Hey i can help you for that ... you can login website tcyonline.com and click on there live chat help they will help you for you rmath queries and if you like then you can buy class as well as they are giving that in very low price i am taking that from them and learning alot ...... Take care ... hope my answer will help you further ,,,,,

Trending News

Pre calculus word problem please help?

5 Answers