a grocer sells apples for $1.35 each, pears for $1.45 each and oranges for $1.60 each. she also offers a discount of 70c for anyone who buys two pieces of fruit, and a discount of $1.60 for anyone who buys three pieces of fruit. one day she sells 50 pieces of each type of fruit, for a total of $202. how many customers did she have, assuming each customer bought 1, 2 or 3 pieces of fruit?