24*15 = 240 + 240/2=360
36*15 =360 + 360/2 = 540
240*15 =2400 + 2400/2 = 3600
88*15 =880 + 880/2 = 1320
42*15 =420 + 420/2 = 630
186*15 =1860 + 1860/2 = 1860 + 930 = 2790
24*15 = 240 + 240/2=360
36*15 =360 + 360/2 = 540
240*15 =2400 + 2400/2 = 3600
88*15 =880 + 880/2 = 1320
42*15 =420 + 420/2 = 630
186*15 =1860 + 1860/2 = 1860 + 930 = 2790