A shopkeeper marks an item 40 % above its cost price. He offers two successive discounts of 10 % and 20 % on the marked price. If the selling price is 504 rupees, what is the cost price of the item?
A bar graph shows the number of students in 5 departments of a college. If the average number of students is 240 and the number of students in the Science department is 320, how many students are there in total in the other four departments?
A pie chart shows the distribution of students across 5 faculties in a university. If 20% are in Arts, 25% in Science, 15% in Law, 30% in Engineering, and the rest in Commerce, what is the angle (in degrees) for Commerce?