To find the cost of 8 kilograms of pulses, when the cost of one kilogram is ₹ 90, we can use the following simple calculation:
First, identify the cost of one kilogram of pulses, which is ₹ 90.
Multiply the cost per kilogram by the number of kilograms you want to purchase:
\(Cost = \text{Price per kg} \times \text{Number of kg}\)
Substitute the given values:
\(Cost = 90 \times 8\)
Calculate the total cost:
\(Cost = 720\)
Therefore, the cost of 8 kilograms of pulses is ₹ 720. Among the given options, ₹ 720 is the correct answer.