Question

If the cost of 1 kg of brass is ₹180 then what is the cost of 4 kg of brass?

• A.
  ₹ 720
• B.
  ₹520
• C.
  ₹430
• D.
  ₹330

Answer 1

The correct option is A

₹ 720
The cost of 1 kg of brass = ₹180

4 kg of brass = ₹180 × 4
This can also be calculated as follows:
$$\begin{array}{ccc}\times & 100& 80\\ 4& 4\times 100=400& 4\times 80=320\end{array}$$
We get the desired result by adding the numbers in last row
= 400 + 320 = 720
Hence, the cost for 4 kg brass ₹720