50
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500/5000 = 0.1
561/5000(101/9)%= (101 ÷ 9)%= 11.22%= 0.1122 in decimal= 1122/10000 or 561/5000 in fraction
21.645
0.78% = 0.0078 in decimal = 78/10000 or 39/5000
It is thought that decimal numbers were used by the Elamite dynasty (Iran) approx 5000 (+/- 500) years ago.