"The bill is twelve dollars."
Translation:He ʻumikūmamālua kālā ke kāki.
"He" before numbers 10-99 (all two-digit numbers) changes a "count" number to an "amount" number. Since it tells how many dollars, it's considered an "amount." Same as ʻaʻohe vs. ʻole and hoʻokahi vs. ʻekahi. Nothing similar in English.
But weird. Now they're not accepting ʻumikūmālua, only ʻumikūmamālua, for twelve (BTW, should be ʻumikumamālua--only one kahakō.)