Question

A car owner buys petrol at rs.7.50, rs. 8 and rs. 8.50 per litre for three successive years.what approximately is the average cost per litre of petrol if he spends rs. 4000 each year

Answer 1

for the first year total litre petrol by car owner
=7.5*4000=30000
for the second year
=8*4000=32000
for the third year
=8.5*4000 =34000
so the total litre of petrol by own by car owner is 30000 +32000 +34000 =96000
total amount spent by car owner is equal to
=4000 *3=12000
so average cost per litre of petrol is
=total litre of petrol divided by amount of rupees
=96000 /12000
=8