Cherry earns $2.50 x 4= $<<2.5*4=10>>10 after delivering four 5 kilograms of cargo per day.
She earns $4 x 2= $<<4*2=8>>8 after delivering two 8 kilograms of cargo per day.
So, her total earning per day is $8+$10= $<<8+10=18>>18.
Therefore, she will earn $18 x 7= $<<18*7=126>>126 in a week.
#### 126