Abuilding is at least 75 stories tall

School has 204 sixth grade students. if the sixth grade is 30% of the total school, how many students are in the middle school?

Ineed the answers for this one as well!

You work for a landscape company that just got a contract to re-mulch a park. the area that needs mulching is 30 feet by 60 feet. they want a 3 inch layer of much on the area. the company has bags of mulch that cover 2 cubic yards that cost $4.00 per bag. how much will it cost the consumer just in materials to re-mulch the area (round to the nearest dollar)?