Winners from last weeks math problem, and the new problem of the week

Attributions: 

The Plot of Land Problem 

Answer:  6 square miles 

Winners: Kyle Bartlett, Andrew Gunyan, Maddy Johnson

The Garden Problem 

Rose fills each of the rectangular regions of her rectangular flower bed with a different type of flower.  The lengths, in feet, of the rectangular regions in her flower bed are as shown in the figure.  She plants one flower per square foot in each region.  Asters cost $1 each, begonias $1.50 each, cannas $2 each, dahlias $2.50 each, and Easter lilies $3 each.  What is the least possible cost, in dollars, for her garden?