Question

A car owner buys diesel 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 diesel if he spends rs. 4000 each year?

Answer 1

4000/7.5=533.33
4000/8=500
4000/8.5=470.58
average rate = 12000/ (533.33+500+470.58)
12000/1503.33=rs 7.99/ L