I couldn't find anyone that led to the answer 20 but the one that ended closest to 20 is the last one.
Answer:
SP=Rs 800
Step-by-step explanation:
→As we have,
→Profit=SP-CP
Now,

Answer: To solve one-step equations, we do the inverse (opposite) of whatever operation is being performed on the variable, so we get the variable by itself. The inverse operations are: Addition and subtraction.
hope this helps