A fruit vender makes a profit of Rs. 5 for every kg of mango he sells but gets a loss of Rs. 4 for each kg of Lichi he sells. He sold 10 kg of mango and 14kg of Lichi. Let’s find his profit or loss on the whole.

In a furniture shop, 15 wooden almirahs were sold in a month there was a profit of Rs 300 on each of the 10 almirahs. But from remaning 5 almirah there was a loss of Rs 200 per almirah. What is the profit or loss the shop owner for the month let's find.

A factory manufactures two types of screws, A and B. Each type of screw requires the use of two machines, an automatic and a hand operated.It takes 4 minutes on the automatic and 6 minutes on hand operated machines to manufacture a package of screw A, while it takes 6 minutes on automatic and 3 minutes on the hand operated machines to manufacture a package of screws B. Each machine is available for at the most 4 hours on any day. The manufacturer can sell a package of screws A at a profit ofRs. 7 and screws B at a profit of Rs. 10. Assuming that he can sell all the screws he manufactures, how many packages of each type should the factory owner produce in a day in order to maximise his profit? Determine the maximum profit.

There is a profit of 20% if an article sold for Rs.500 . What will be selling price if the article is sold at a loss of 10%?

A merchant plans to sell two types of personal computers- a desktop model and a prtable model that will cost Rs. 25000 and Rs. 40000 respectively. He estimates that the total monthly demand of computers will not exceed 250 units. Determine the number of units of each type of computers which the merchant should stock to get maximum profit if he does not want to invest more than Rs. 70 lakhs and if his profit on the desktop model is Rs. 4500 and on portable model is Rs. 5000.