Calculus Homework Help

Hi, 

I am posting a question from the topic Optimization in Calculus I. The prerequisite in solving this question :

a) Understanding of global maxima and global minima using the first and second derivative tests.

b) Differentiation rule.

Question : 

A rectangular storage container with an open top is to have  a volume of (10m^3). The length of its base is twice the width. Material for the base costs ($10) per square meter. Material for the side costs ($6) per square meter. Find the cost materials for the cheapest such container.