Question

A driver filled 40L of petrol in his car on Monday next day he filled 50 litres of petrol is the petrol cost rupees 45 per litre how much did he spend in all on petrol

Answer 1

you have to add 40+50 and multiply by 45.
90×45
=4050

Answer 2

First take the sum of total litre
That is 40 + 50 litre
90litre
If 1 litre cost is 45 rupees then
90 litre cost
45 *90
4150rupees