That depends on whether you mean long scale or short scale billions. A long scale billion is equal to a short scale trillion (one million millions or 1012), whereas a short scale billion is only one thousand million (109).
Using a short scale billion, 80.3 billions would be 80,300,000,000. The Romans would have probably used a shorthand, such as "LXXX•••• milliard". The •••• represents 4/12, which is 1/3. A milliard is one thousand million (a short scale billion).
It is: (MM)DCCCIII which means 1000*2000+803 = 2,000,803
803%
803
Roman Numeral MMDLXII
How do you write the decimal numeral for ten and two tenths
803.0054
Fifteen-hundredths as a numeral is 0.15
It is: 500 = D as a Roman numeral
1155
2001 as a roman numeral is MMI
As a Roman numeral 326 is CCCXXVI
CCLXMMMCDXXIV is the Roman Numeral of 263424.