Question

In a shipment of onions, 12% are damaged. 1,144 onions are undamaged.

Answer 1

Since 12% of them are damaged, that means the percentage of them that aren't 88%. 
The easiest way to do it is to divide 88 from 1,144, written as 1,144÷88.
That's 13. So, then you would multiply 13 by 100. To get the total amount of onions. That'd be 1,300.