The only answer I know could be that a gas station company started doing it a long time ago to trick people and make more money. Eventually all companies had to comply to keep up.
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Nine and nine tenths = 9 + 9/10 = 9.9
0.9 in word form is nine tenths.0.9 = nine tenths.
It is seventy-eight and nine tenths.
Nine and nine tenths in decimal form is 9.9
OK, SO, 0.9 is equal to nine-tenths. this is because 0.9, the nine is in the tenths place, and there is a nine, so nine tenths. HOpe this helps!