30*40/100=12

Correct. 30 × 40 ÷ 100 = 12.

You can see it as 40% of 30, which is 0.40 × 30 = 12. Quick methods:

• Convert percent to decimal: (percentage)% × number.
• Or (number ÷ 100) × percentage.

Would you like a few more practice examples?