He will write for 120 hours because 2 x 60 = <<2*60=120>>120
He will write for 24 units of five minutes each because 120 / 5 = <<120/5=24>>24
He can write 600 words because 24 x 25 = <<24*25=600>>600
He can earn $6 because 600 x .01 = <<600*.01=6>>6
#### 6