Question

Rahul rented a house for ₹520 per month. How much will he pay for 12 months?

• A. ₹2400
• B. ₹6240
• C. ₹9240
• D. ₹16240

Answer 1

The correct option is B ₹6240

Rent for one month = ₹520
So rent for 12 months =12 x ₹520
520 can be written as 52 x 10
So to find 12 x 520 we can perform 12 x 52 and add a zero in the end.
So 12 x 520 = 12 x 52 x 10

12 x 52 =
$$\begin{array}{ccc}\times & 50& 2\\ 10& 500& 20\\ 2& 100& 4\end{array}$$

= ₹500 +₹100 +₹20 +₹4
= ₹624

Now we just need to multiply it by 10, so ₹624 x 10 = ₹6240
$\therefore$ Rahul will pay ₹6240 for 12 months.