A rectangular storage container with an open top is to have a volume of 10m3. The length of the base is twice the width. Material for the base costs $10 per square meter, while the material for the sides costs $6 per square meter. Find the cost of materials for the cheapest such containers.
Round your answer to the nearest cent.
The cost of the cheapest container is ? dollars

2.Megan was given 300 feet of fencing to use as a rectangular border that surrounds her garden. Her garden lies next to a river, therefore no fencing will be used along the river. What is the maximum area she can obtain under these conditions.
Round the answer to the nearest integer, also please do not include units.
the maximum area is= ? ft2