The correct option is (B): Rs.350
Explanation: Let us cost price of article =\(Rs \space100x\)
Rs. Let marked price be Rs. = \(Rs \space100y\)
Given that \(7\%\) of MP\(= 8\%\) of CP
⇒ \(7x=8y\)
⇒\(9y-10x=1\) (from question)
from these two equations we get \(y=4 \) and \(x=3.5\)
So, cost of Article= \(3.5\times100=350\)
In a survey, 60 % of 200 students prefer online classes, and 25 % of the remaining prefer hybrid classes. How many students prefer neither?