\"\"

\

Simple interest \"\".

\

\"\"          (Substitute \"\")

\

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

\

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

\

Simple interest is $72.9.\"\"

\

Amount \"\".

\

\"\"                (Substitute \"\")

\

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

\

Amount is $672.9. \"\"

\

Simple interest is $72.9.

\

Amount is $672.9.