9) morgan has an investment worth $130,000 dollars after 20 years. if his original
investment was for $50,000 what must the interest rate have been?

Answer : The interest rate have been 8 %

Step-by-step explanation :

First we have to calculate the simple interest.

As we know that:

Simple interest = Total amount - Principle

Simple interest = $130,000 - $50,000

Simple interest = $80,000

Now we have to calculate the interest rate.

Using simple interest formula:

where,

S.I = simple interest = $80,000

P = principle = $50,000

R = interest rate = ?

T = time = 20 years

Now put all the given values in the above formula, we get:

Therefore, the interest rate have been 8 %

hope this is what you were asking for!

step-by-step explanation: