Two and seventy-eight hundredths.
It is: 278 = CCLXXVIII
You write 8 million 8 thousand 278 as 8,008,278
It is two hundred seventy eight.
88278
8,000,008,278
278 is an integer and so there is no sensible way to express it as a mixed number. However, if pushed, you could write it as 278 0/n where n is any positive integer.
15% of 278= 15% * 278= 0.15 * 278= 41.7
55% of 278= 55% * 278= 0.55 * 278= 152.9
75% of 278= 75% * 278= 0.75 * 278= 208.5
24.6% of 278= 24.6% * 278= 0.246 * 278= 68.388
10 percent off 278.00 = 250.210% off of 278= 10% discount applied to 278= 278 - (10% * 278)= 278 - (0.10 * 278)= 278 - 27.8= 250.2
10% off of 278 = 90% [left] of 278 = 278*90/100 = 250.2