In a day, Megan earns 8 x $7.50 = $<<8*7.5=60>>60.
In a month, she will be earning 20 x $60 = $<<20*60=1200>>1200.
Therefore, Megan will earn a total of 2 x $1200 = $<<2*1200=2400>>2400 for two months of work.
#### 2400