Answer:
7 11/23%
Explanation:
To find rate u use the method of finding simple interest
Simple interest= Principal× Rate × Time
SI=PRT/100
$4000=$18000×r×3yrs/100
Now u divide 100 by 18000
To do that u cancel out all the zeros
Now u remain with;-
$4000=$180×r×3yrs
$4000= $540×r
Now u divide;-
$4000/540=540×r/540
The answer is 7 11/23%