Joan borrowed $1800 and is to repay the balance plus interest of $50 in 7 months. What was the rate of interest charged? The interest rate is % . (Round the final answer to two decimal places as needed. Round all intermediate values to six decimal places as needed.) .
Joan borrowed $1800 and is to repay the balance plus interest of $50 in 7 months. What was the rate of interest charged? The interest rate is % . (Round the final answer to two decimal places as needed. Round all intermediate values to six decimal places as needed.) .