You rent an apartment that costs $1800 per month during the first year, but the rent is set to go up $160 per year. What would be the monthly rent during the 9th year living in the apartment?

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?