31*28*15 $7.07; 29*27*14 $6.36; 27*25*13 $5.45; 25*23*12 $4.65; 23*21*11 $4.04; 21*19*10 $2.93; 19*17*9 $2.37; 17*15*8 $2.07; 15*14*7 $1.46