1. at the hardware store, you purchased a box of nails originally worth $17.   you had a coupon that took off 20% from the nails.   sales tax is 6%.   what is the total cost for the nails?   2. suppose we are at a restaurant and have ordered $29.31 worth of food and $9.72 worth of beverages.   the sales tax rate is 6% and we wish to leave a 20% tip.   how much is the total we will pay for this meal including tip?