The dinner cost $144 dollars because 4 x 36 = <<4*36=144>>144
The kids earned $288 in total because 144 x 2 = <<144*2=288>>288
They planted 192 rows of corn because 288 / 1.5 = <<288/1.5=192>>192
They planted 13,440 ears of corn in total because 192 x 70 = <<192*70=13440>>13,440
They each planted 3,360 ears of corn because 13,440 / 4 = <<13440/4=3360>>3,360
They each planted 6,720 seeds because 3,360 x 2 = <<3360*2=6720>>6,720
They each used 140 bags of seeds because 6,720 / 48 = <<6720/48=140>>140
#### 140