To start, it would be helpful to scale the lower portion of the number line. Do you remember how to do this?
Now that you know 10% is equal to $3.40, can you scale the rest of the number line to find the value of 20%?
First, we can find out how much money will be just one tick mark on the number line. Start by counting the number of tick marks (10). We know that $34 will be distributed among these tick marks.
With the information gathered in Step 1, we can now find what amount will be labeled on the first tick mark (10%). We will find this value by dividing the total $34 (100%) by the number of tick marks (10).
Each tick mark represents $3.40.