Adelyn goes shopping at Wal-mart. She buys 2 packs of red pens for $2.95 each, 1 notebook for $2.50 and a pencil sharpner for $0.85. Wal-mart sales tax is 10%. Explain in writing (typing) how you would solve this problem to find the amount she spent at Wal-mart. Then explain how you could find the amount of change she should receive if she pays with a 20 dollar bill. (Remember to write 5 or more complete sentences.)