Answer: 1. 10,000 2. Although I was late to work, I still got my work done. 3. Use commas to separate every three digits in a figure. "Our sales department made $500,000"
Step-by-step explanation:
1. Separate the last three or every three digits in a figure.
2. The sentence starts with "Although". A comma is needed between the two sentence structures.
3. Every three digits in a figure need a comma in between.