In other words, any volume over 10 mL but under 20 mL (for example, 11 mL or 19 mL) is charged at the rate for 20 mL, and so forth
Ngamanye amagama, noma yiliphi ivolumu elingaphezu kwe-10 mL kepha lingaphansi kuka-20 mL (ngokwesibonelo, i-11 mL noma i-19 mL) ikhokhiswa ngesilinganiso se-20 mL, nokunye