Greg purchased supplies for a party. He had a coupon good for 30% off. He purchased a helium tank rental with an original price of $31. 61, a sheet cake with an original price of $18. 44, a punch bowl with an original price of $12. 78, and paper decorations with an original price of $23. 69. Greg’s total came to $80. 99. To which item did Greg apply his coupon? a. Cake b. Helium tank rental c. Paper decorations d. Punch bowl.