Description:
1. interest calculation formula: interest = principal × interest rate.
2.4. 18% can be converted into decimal form, that is, 0.04 18.
3. Interest = 30,000× 0.0418 =1254 yuan.
Summary:
According to the given interest rate and principal, the annual interest rate can be 1254 yuan by using the interest rate calculation formula. Please note that this calculation result is based on hypothetical conditions, such as not providing specific interest period and other information. In addition, the calculation of interest is also affected by factors such as deposit method and compound interest calculation, which needs to be considered in practical application.