Jill bought a textbook online with her credit card. The website offered a 15% discount off the original price of the textbook. She was able to apply a discount code to her purchase which gave her an additional 10% off the discounted price. If she paid 9% tax upon checkout, what was the
original price of the textbook in terms of the amount that was charged to her credit card?
a- 1.20c
b-1.22c
c-1.08c
d-1.31c