If 20 percent of 80 percent of a number is 12.8, then what is the number ?

If 20 percent of 80 percent of a number is 12.8, then what is the number ? Correct Answer 80

Let, the number is xAccordingly, 20%× 80% × x = 12.8⇒ x = (128 × 100 × 100)/(20 × 80 × 10)= 80