Pavan went to a market and bought 4 kg of potato at Rs. 20 per kg and 5 kg of onion at Rs. 40 per kg. How much did he spend in total?
Amount spent on potatoes = Quantity of potatoes bought x price of 1kg of potatoes
= 20 x 4 = Rs.80
Amount spent on onions = Quantity of onions bought x price of 1kg of onions
= 40 x 5 = Rs.200.
Total money spent
= Amount spent on potatoes + Amount spent on onions
= 80 + 200 = Rs.280.