Explanation

Explanation

If 20% of the students are girls, then the remaining percentage (100% - 20% = 80%) represents the boys.

So, in a class of 40 students:

80% of 40 = (80/100) * 40 = 0.8 * 40 = 32

Therefore, there are 32 boys in the class.

Explanation

To find the original price, we need to remove the GST amount from the inclusive price.

Price including GST = Rs. 945

GST percentage = 5%

First, convert the GST percentage to a decimal: 5% = 0.05

Then, divide the price including GST by (1 + GST decimal):

Rs. 945 ÷ (1 + 0.05) = Rs. 945 ÷ 1.05 = Rs. 900

Explanation

To calculate the percentage of discount, you can use the following formula:

percentage discount = (original price – new price) / original price * 100%

In this case, the original price is 0.62 and the new price is 0.42. So, the calculation would be:

percentage discount = (0.62 – 0.42) / 0.62 * 100% = 0.2 / 0.62 * 100% = 0.3225806452 * 100% = 32.26% ~= 32%

Therefore, the actual percentage of discount is 32%.

Explanation

1.44 kg = 1440 grams.

$$text{Percentage} = left( frac{72}{1440} right) times 100 = 5$$