Nancy sold a house $225,900 and earned a 4% commission. how much did nancy earn for the sale of this house?

For this case, what we must do is find 4% of the total amount.
 For this, we can make the following rule of three:
 $ 225900 ------------------> 100%
 X ----------------------------> 4%
 From here, we clear the value of x.
 We have then:
 
 
 Nancy earn for the sale of this house about 9036 $

J= r + 9 because since jessica rode 9 more miles than roger, you add 9 miles to rogers mileage.