Question

What will be the cost of one dozen balls and 3 bats, if one ball and bat costs ₹17 and ₹183 respectively.

• A. ₹219
• B. ₹249
• C. ₹549
• D. ₹753

Answer 1

The correct option is D ₹753

The cost of 1 ball = ₹17
We know that in a dozen 12 pieces are there.
12 balls would cost = ₹17 × 12
This can also be calculated as follows:
$$\begin{array}{ccc}\times & 10& 7\\ 10& 100& 70\\ 2& 20& 14\end{array}$$
We get the desired result by adding the numbers in last row
= 100 + 70 + 20 +14 = ₹204

Now to find the cost of three bats we need to multiply
₹183 x 3
This can also be calculated as follows:
$$\begin{array}{cccc}\times & 100& 80& 3\\ 3& 3\times 100=300& 3\times 80=240& 3\times 3=9\end{array}$$
We get the desired result by adding the numbers in last row
= 300+240+9 = ₹549
Hence, the total cost = ₹204 + ₹549
= ₹753