rate = (A - P) / (P * t)
Plugging in the values given, we get:
rate = ($6180.00 - $6000.00) / ($6000.00 * 1 year) = 0.03
This is a rate of 3%. To express it as a percentage, multiply it by 100% to get 3%. Rounded to the nearest tenth of a percent, the simple interest rate is 3.0%.