While out shopping for new clothes, Xaoting sees a sign for cozy socks advertised on sale for $3. 50 per pair. The regular price of the socks is $5 per pair. Xaoting buys 3 pairs and notices that the socks do not ring up at the advertised sale price, so she has the cashier do a price check. If the sales tax is 8%, how much does Xaoting save by paying attention at the register? a. $3. 66 b. $4. 50 c. $4. 86 d. $5. 70.