Are their any countries that still use a non decimal money system?

Answer 1

Wikipedia says.

Today, only two countries in the world use non-decimal currencies. These are Mauritania (1 ouguiya = 5 khoums) and Madagascar (1 ariary = 5 iraimbilanja). In both cases the value of the main unit is so low that the sub-unit is too small to be of any practical use and coins of the sub-unit are no longer used.

All other contemporary currencies are either decimal or have no sub-units at all.