Tran invests 15,000 in a savings account that pays 4% simple intrest. About how many years will it take for the account to double at this interest rate?

For simple interest, we can make an equation.

Since we know that it will be 4 percent of 15,000, we need to find 4 percent of 15,000.

15,000*.04 = 600

So 600 will be the amount Tran will receive every year.

15,000+600x=y

X is the amount of years and Y will be the total amount. The total amount we are looking at is double the starting value. 15,000 doubled is 30,000.

15,000+600x=30,000

We need to solve the equation by subtracting 15,000 from each side first.

600x=15,000

Now, let's divide 15,000 by 600.

15,000:600=25

It will take 25 years for the account to double.