Sharon made $45 in interest by placing $500 in a savings account with simple interest for 1 year. What was the interest rate?

The interest rate was 9%.

Step-by-step explanation:

If principal amount P is invested at the rate of r percent with simple interest(I) for t years, the formula to find rate :

As per given,

P = $ 500, I = $45, t = 1 year

Substitute values in formula , we get

Hence,  The interest rate was 9%.

That equals to 2500 people per square mile!

Step-by-step explanation:

We have to first get the area of the trapezoid. Which is (((a +b)/2)) * h

a = 8

b = 12

h = 8

Time to solve!

20/2 = 10!

10 * 8 = 80 square miles!

Now let's do 200000/80 to get the amount of people per square mile.

That equals to 2500 people per square mile!