SOLUTION
Given the question in the image, the following are the solution steps to answer the question.
STEP 1: Write the cost of riding the bike per kilometer
[tex]1km=\text{ \$}5[/tex]
STEP 2: Calculate how much Charles will, pay for 10 km
[tex]\begin{gathered} 1km=5\text{ dollars} \\ 10km=5\times10\text{ dollars}=50\text{ dollars} \end{gathered}[/tex]
Hence, Charles will need to pay $50
