Question

If 1 kg of steel costs ₹120.
Find the price for 4 kg of steel.

• A. ₹ 300
• B. ₹ 450
• C. ₹ 480
• D. ₹ 530

Answer 1

The correct option is C ₹ 480

Price of 1 kg of steel = ₹120
Price of 4 kg of steel = 4 $\times$ Price of 1 kg steel
= ₹4 $\times$ 120
Let's solve it by using box method.
120 = 100 + 20
4 = 4
$$\begin{array}{ccc}120\times 4& 100& 20\\ 4& 400& 80\end{array}$$
Adding the products we get = ₹400 + ₹80 = ₹480
Therefore, the price of 4 kg of steel is ₹480.