40% of 30 is 12. To calculate this: 1) Convert 40% to decimal (40/100 = 0.4), 2) Multiply by 30 to get 12.

What is 40% of 30?

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Result

40% of 30 = 12

40\% \times 30 = 30 \times \frac{40}{100} = 12

40% means 40 parts out of 100. To convert a percentage to a decimal, we divide by 100: 40% = 0.4

We multiply our number (30) by the decimal form of the percentage (0.4):
30 × 0.4 = 12

This means that 40% or 0.4 of 30 is 12. In other words, if you take 40% of 30, you get 12.

When a $30 product has a 40% discount, you save $12 and pay $18.

If you want to leave a 40% tip on a $30 meal, you would leave $12 as the tip.

When 40% sales tax is added to a $30 purchase, $12 is added for tax, making the total $42.

If 40% of students in a class are boys and there are 30 students total, that means there are 12 boys.

If you invest $30 and earn 40% annual interest, you'll receive $12 in interest for the year.

If a student answers 40% of questions correctly on a 30-question test, they answered 12 questions correctly.

If 40% of your monthly revenue goes to operating expenses and you earn $30, you spend $12 on operations.

If a hospital reduces infections by 40% from 30 cases monthly, they now have only 18 cases per month.

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