You have $3000 with which to build a rectangular enclosure with fencing. The fencing material costs $20 per meter. You also want to have two partitions across the width of the enclosure, so that there will be three separated spaces in the enclosure. The material for the partitions costs $15 per meter. What is the maximum area you can achieve for the enclosure? (Round your answer to the nearest whole number.)

I am confused with what I would have to do with the $20 and $15 constraints in this problem?