A city charges 8% sales tax on non-food items sold by stores. (If you have the total money spent on items, you can multiply this value by 1.08 to get the total including tax that you must pay.) If you have a coupon, the store deducts the value of the coupon from the price BEFORE calculating sales tax. Suppose you have a coupon for $15 off your total purchase.

1. If you purchased $90 worth of items and then use your coupon, what is the total price after tax?  
2. If you purchased $138 worth of items and then use your coupon, what is the total price after tax?
3. If you purchased $203 worth of items and then use your coupon, what is the total price after tax?