The cost of 1 litre of refined oil is ₹124.75. What is the cost of 6.2 litres of this oil?

Given:

Cost of 1 litre of refined oil = ₹124.75

Total quantity of oil = 6.2 litres

Cost of 6.2 litres of oil = ?

Cost of 6.2 litres of oil = (Cost of 1 litre) x (Total quantity)

Substituting the values in above, we get:

Cost of 6.2 litres of oil = (₹124.75) x (6.2 litres)

Sum of the decimal places in given decimals = 2 + 1 = 3

So, the product contains 3 places of decimal

$\begin{matrix} & & 1 & 2 & 4 & 7 & 5 \ \times & & & & & 6 & 2 \ \hline & & 2 & 4 & 9 & 5 & 0 \ & 7 & 4 & 8 & 5 & 0 & \times \ \hline & \bold{7} & \bold{7} & \bold{3} & \bold{4} & \bold{5} & \bold{0} \end{matrix}$

∴ 124.75 × 6.2 litres = ₹773.450 = ₹773.45

Hence, the cost of 6.2 litres of oil = ₹773.45