Charles wants to buy a book that is on sale for half off. Let b represent the original price of the book, in dollars. The sales tax is 6% of the
discounted price.
Which expression represents the price that Charles will pay for the book?

the mistake in the pattern is that :

b. the decimal point was moved one too many place values each time

the correct pattern could be made by :

b. moving the decimal point to the right the same numbers of place values as the exponents

i believe the answer is the polygon, heptagon.