In gate it is not wise to predict answer, but be 100% sure. But instead of doing the whole calculation, we can apply some shortcut. Manually, it is easy to do summation rather than multiplication. Hence from the given table directly do the addition for all 4 products ( who has done a lot of practice, it is very easy for then to add without actually writing all the numbers in paper, especially when the numbers are perfectly arranged ). Now you will see that the results are in decreasing order that is – 102,510; 80,059; 62,586; 39,284. Now, (price of Executive per piece / price of elegance per piece ) = 173/48 = 3.something. If we just do 39,284 * 3 = 117,852 > 102,510. so Executive produces highest revenue. I think this approach saves some time.