\"\"

\

Original Price = $78.

\

Sales tax = 6%.

\

\"\"

\

\"\"     (Substitute 78 for Original price and 6% for Sales tax)

\

\"\"  (Write 6% as a decimal)

\

\"\"         (Multiply: \"\")

\

\"\"               (Add: \"\")\"\"

\

Total cost is $82.68.