5. Kelly Fisher has a total of $30,000 invested in two municipal bonds that have yields of 8% and 10% interest per year, respectively. If the interest Kelly receives from the bonds in a year is $2640, how much does she have invested in each bond

$18,000

$12,000

Explanation:

The formula for simple interest = (P x R × T ) / 100

P = principal

R = interest rate

T = time

Let x = amount invested in the bond thay yields 8%

And y = amount invested in the bond thay yields 10%

We know that

X + y = $30,000

And

0.08X + 0.10y = $2640

We have to solve for x and y using simultaneous equation

Make y the subject of the formula in the first equation

Y = $30,000 - x

Substitute for y in the second equation:

0.08x + 0.10 ($30,000 - x ) = $2640

0.08x + 3,000 - 0.10x = $2640

Collect like terms and solve for x

-0.02×=$-360

× = $18,000

Substitute for x in the first equation , y = $12,000

I hope my answer helps you

answer; ///i believe the correct   answer is (e) transformational;

you have to put the parentheses like this:

in fact, you have to perform the operation inside parentheses first, and then proceed in order: