That means what is the least u would spend and most so like if someone asked you how much you would pay for a product, you may say $7-$10 and 7 would be the low range and 10 would be the high range
Assuming that you will need all the amounts in high range, the total budget is = $2,046.45 + 877.05 + 877.05 + 1169.40 + 1169.40 + 409.29 + 877.05 = 7425.69.
Multiply the net monthly pay by the % of monthly income of each item.