Alright! My final question on here till next semester lol. Doing some last minute review for my final tonight and came across this problem having a little trouble with it.

A rectanglular storage container with an open top is to have a volume of 10 cubic-meters. Material for the sides costs $6 per square-meter. Material for the base costs $10 per square-meter. Find the cost of materials for the cheapest container.

Thanks

{edit} ah yes sorry. Length of its base is twice the width.