The marked price of the item is Rs. 400.
Price after the first discount:
\[ \text{Price after first discount} = 400 \times (1 - 0.30) = 400 \times 0.70 = 280 \]
Price after the second discount:
\[ \text{Price after second discount} = 280 \times (1 - 0.20) = 280 \times 0.80 = 224 \]
Price after the third discount:
\[ \text{Price after third discount} = 224 \times (1 - 0.20) = 224 \times 0.80 = 179.2 \]
Price after the fourth discount:
\[ \text{Price after fourth discount} = 179.2 \times (1 - 0.10) = 179.2 \times 0.90 = 161.28 \]
The actual selling price of the item is Rs. 161.28.
In a survey, 60 % of 200 students prefer online classes, and 25 % of the remaining prefer hybrid classes. How many students prefer neither?