Mary opened a savings account with a deposit of $18,000. The account earned simple interest.
He did not make any additional deposits or withdrawals.
At the end of 6 years, the account balance was $18,756.
What is the annual interest rate on this account?

0.6%

0.7%

4.1%

4.2%

When rates are expressed as a quantity of 1, such as 2 feet per second or 5 miles per hour, they are called unit rates. if you have a multiple-unit rate such as 120 students for every 3 buses, and want to find the single-unit rate, write a ratio equal to the multiple-unit rate with 1 as the second term.