TJ invested $8000 in a bond at a yearly rate of 4% simple interest. He earned $1120
in interest. How long was the money invested?

3.5 years (3 years 6 months)

Step-by-step explanation:

You are going to use the simple interest formula for this:

P = initial balance

r = annual interest rate

I = interest

First, change 4% into a decimal:

4% -> -> 0.04

Now, plug in the values into the equation:

The money was invested for 3.5 years (3 years 6 months).

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