\"\"

\

Simple interest \"\".

\

\"\"        (Substitute \"\")

\

\"\"              (Multiply: \"\")

\

\"\"                      (Multiply: \"\")

\

Simple interest is $43.31.\"\"

\

Amount \"\".

\

\"\"            (Substitute \"\")

\

\"\"                   (Add: \"\")

\

Amount is $538.31. \"\"

\

Simple interest is $43.31.

\

Amount is $538.31.