There were 20 x 0.20 = <<20*0.20=4>>4 sacks of rice increase after the first harvest.
So the total sack of rice that you can get on the next harvest 20 + 4 = <<20+4=24>>24.
Therefore the total number of sacks of rice you will get on the first and second harvest is 20 + 24 = <<20+24=44>>44.
#### 44