The seventh grade class is raising money to have a class trip at the end of the year they began the year with $1500 now they have $1650 in the account. what is the percent of increase for the money the class has raised?

Agroup 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?