Answer:
Option (c).
Explanation:
It is given that, I paid twice as much by not waiting for a sale and not ordering online.
Let the cost of items ordering online be x.
So, now i am paying twice of x = 2x
Now, we have find 2x is what percent of x.

It means, I paid 200% of what I could have online and on sale.
Therefore, the correct option is (c).