 Hi and welcome to the session. I am Asha and I am going to help you with the following question which says, a taxi driver filled his car petrol tank with 40 litres of petrol on Monday. Then next day, he filled the tank with 50 litres of petrol. If the petrol cost rupees 44 per litre, how much did he spend in all on petrol? First let us learn the distributive law of multiplication. If A, B and C are three whole numbers then A into B plus C is equal to A into B plus A into C. So this is the clear idea we are going to use in this problem to find how much the taxi driver spent in all on petrol. Let us now start with the solution. Cost of petrol is equal to rupees 44 per litre. The total amount of petrol for two days is, that is for Monday and for Tuesday, is equal to 40 plus 50 litres. Cost of one litre of petrol is equal to rupees 44. Therefore cost of 40 plus 50 litres of petrol is equal to rupees 44 into 40 plus 50 is equal to rupees. Now by the distributive law of multiplication we have 44 into 40 plus 44 into 50. Now 44 into 40 is equal to 1760 plus and 44 into 50 is equal to 2200. For adding we get rupees 3960. Therefore the money spent on petrol for two days is rupees 3960. So this completes the solution. Hope you enjoyed this session. Take care and bye for now.