A taxidriver filled his car petrol tank with 40 litres of petrol on Monday.The next day, he filled the tank with 50 litres of petrol. If thepetrol costs Rs 44 per litre, how much did he spend in all on petrol?
Quantityof petrol filled on Monday = 40 l
Quantityof petrol filled on Tuesday = 50 l
Totalquantity filled = (40 + 50) l
Cost ofpetrol (per l) = Rs 44
Totalmoney spent = 44 × (40 + 50)
= 44 × 90 = Rs 3960