- Standard capacity is 500g/l:

When measuring the standard volume of the standard, people use a specialized liter for measuring standards. This capacity has a volume of 1 liter, when measuring the capacity of black pepper, people use this liter to fill a liter and then weigh how many grams it is.

For example, measuring 1 liter of pepper to weigh 550 grams, the weight of pepper is 550 grams / liter. - Take the capacity of 500g / liter as standard, if the standard of black pepper is lower, we subtract zem, if it is higher, we add zem.

1 zem is equivalent to 10g (1%).

For example, black pepper has a capacity of 450g / l, we see this pepper is 50g lower than the standard, so in the formula to calculate the price of pepper we subtract 5 zem. - Each zem is equivalent to 1% of the first price

For example, the first price: is 40,000 VND/kg. So 1 zem is 400 dong. (take (40,000 x 1)/100 = 400)

In this case, 5 zem will be deducted, equivalent to 2,000 VND.

In case the pepper measured is 550g/liter, then +5 zem is obtained, equivalent to 5zem x 400d = +2000d.