Tom starts a savings account with ＄$$4,000$$ at a bank. The interest rate is $$2\textbackslash\%$$ per year. How much interest will he earn in his savings account at the end of the second year? 
Overseas Competition->Knowledge Point->Word Problem Modules->Word Problems in Economics->Interest Problems
$$4000\times \left( 1+2\textbackslash\% \right)\times \left( 1+2\textbackslash\% \right)-4000=161.6$$. 