Question

Cost of one kilogram pulses is ₹ 90, then what will be the cost of 8 kilogram pulses?

• A. ₹ 720
• B. ₹ 740
• C. ₹ 780
• D. ₹ 800

Hint:

To find total cost when unit price and quantity are given: Total = Price × Quantity. For quick multiplication by 8: double thrice (90 → 180 → 360 → 720).

Answer 1

The Correct Option is A

This is a simple multiplication problem involving unit cost and quantity. Given:

Cost of 1 kg pulses = ₹ 90
Quantity = 8 kg
Calculation: \[ \text{Total Cost} = \text{Cost per kg} \times \text{Number of kg} \] \[ \text{Total Cost} = 90 \times 8 \] \[ \text{Total Cost} = 720 \] Step-by-step: \begin{align} 90 \times 8 &= (90 \times 10) - (90 \times 2)
&= 900 - 180
&= 720 \end{align} Or simply: \( 9 \times 8 = 72 \), then add one zero → 720 Why Other Options are Incorrect:

(B) ₹ 740: This would be \( 90 \times 8.22 \) approximately, incorrect
(C) ₹ 780: This would be \( 90 \times 8.67 \), incorrect
(D) ₹ 800: This would be \( 100 \times 8 \), incorrect
Final Answer: ₹ 720