Margin decided in a hurry
Example: A party needs a truck within the hour. You agree ₹59,500 hire on a load billed at ₹62,000, a 4% margin when you work at 8%, because there was no time to check.
The challan shows party freight against hire in ₹ and % while you type, with your past hires on the same lane, and turns red below your minimum.