As I have no 3 tariff bill , I assume these percentages will be applied to the unit price. ( Birim Fiyat - might appear shifted a few lines down or up on the printed bill ).
My last bill shows this unit price as 0,251538 on all 3 columns.
These columns have the appropriate headings showing the 3 time slices.
Rather than trying to calculate the outcome of a possible 3 tariff bill , I personally would try to make a picture based on the percentages.