\"\"

\

Simple interest \"\".

\

\"\"          (Substitute \"\")

\

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

\

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

\

Simple interest is $4.\"\"

\

Amount \"\".

\

\"\"                   (Substitute \"\")

\

\"\"                         (Add: \"\")

\

Amount is $104. \"\"

\

Simple interest is $4.

\

Amount is $104.