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# A taxi driver filled his car petrol tank with 40 litre of petrol on Monday. The next day he filled the tank with 50 litre of petrol. If the petrol costs Rs. 44 per litre, how much did he spend in all on petrol?

**Given:** Driver filled 40 litre of petrol on Monday, the next day he filled the tank with 50 litre of petrol. Cost of the petrol is Rs. 44 per litre.

**To find: **Here we have to find the total money spent by driver on

**Solution:**

Petrol filled on Monday = 40 liters

Petrol filled on next day = 50 liters

Total petrol filled = 90 liters

Now,

Cost of 1 liter petrol = Rs. 44

Cost of 90 liters petrol = 44 $\times$ 90

Cost of 90 liters petrol = 44 $\times$ (100 $–$ 10)

Cost of 90 liters petrol = 44 $\times$ 100 $–$ 44 $\times$ 10

Cost of 90 liters petrol = 4400 $–$ 440

**Cost of 90 liters petrol = Rs. 3960**

Therefore, he spent Rs. 3960 on petrol.

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