Question

Problem Page Last year, Donna had $30,000 to invest. She invested some of it in an account that paid 9% simple interest per year, and she invested the rest in an account that paid 6% simple interest per year. After one year, she received a total of $1950 in interest. How much did she invest in each account?

Answer 1

Answer:

The money invested in the account 1 was $25,000 and in the account 2 was 5,000.

Step-by-step explanation:

In this case we can formulate a system of equations that could find the amount invested in each account, this is:

Money invested in the account 1 is A

Money invested in the account 2 is B

Eq. 1: $A+B=30,000$

Eq. 2: $\frac{9}{100} *A+\frac{6}{100} *B=1,950$

Replacing the equation 1 in 2, this is:

$\frac{9}{100} *(30,000-B)+\frac{6}{100} *B=1,950Clearing the value of B:[tex]2,700-0.09B+0.06B=1,950$

$2,700-1,950=0.09B-0.06B$

$750=0.03B$

$B=\frac{750}{0.03}$

$B=25,000$

Now, we can find A:

$A=30,000-B\\A=30,000-25,000\\A=5,000$

The money invested in the account 1 was $5,000 and in the account 2 was 25,000.