Thirteen thousand.
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13000 written in scientific notation is 1.3 × 10^4
To write 13000 in Roman numerals, you would use the numeral "X" for 10, followed by the numeral "M" for 1000 three times, resulting in "XXXM".
It is: 1.3*10^4
3% of 13000 = 3% * 13000 = 0.03 * 13000 = 390
10% off 13000 = 13000 - (0.1 x 13000) = 11700