Mary has gone into a department store with two coupons. One coupon is good for 20% off of the total not including tax. The other coupon will take $15 off of her pre-tax total. If f(x) = 0. 8x calculates the total after the 20% off coupon and g(x) = x – 15 calculates the total after the $15 dollar off coupon, determine g(f(100)). Then describe what g(f(100)) represents in the context of this problem
