Q1What does "per centum" literally mean?

Q240% of 250 equals:

Q3Price rises from ₹200 to ₹250. What is the % increase?

Q4If 30% of a number is 90, the number is:

Q5Which civilisation first used per-hundred fractions for taxation?

Q6Three successive increases of 10%, 20%, 25% on ₹100 give a final value of:

Q7Population grew 25% then fell 20%. Net change is:

Q8Salary rises 20% — to restore original it must fall by: