help me please and thank you

Answer:
C. Gabi did not make a mistake.
Step-by-step explanation:
Step 1: She multiplied by 10 on both sides of the equation.
Step 2: Simplify.
You can always check a solution by putting the answer back into the original equation.
j/10 = 80
800/10 = 80
80 = 80 Yes!