Alex agreed to pay tax and tip at a restaurant with her four friends. Her friends paid 96 in total. If tax and tip totalled 20% of the cost of the meal, how much less did Alex pay than any one of her friends?

He ! a group of farmers planned to clean 80 acres of wheat per day to finish the work on schedule. right before the work started, they received a new piece of machinery that them clean 10 more acres per day than originally planned. as a result of increased productivity in the last day before the deadline they only had to clean 30 acres. how many acres of wheat did the group of farmers have to clean?