Step: Find how much he has to pay for a year
Given: Rent paid by Mr. Chopra for 3 months = Rs 12,000
⇒ Rent of 1 month = 120003
= Rs 4000
We know that,
One year = 12 months
⇒ Rent of 12 months = 12×4000
= Rs 48000
Hence, the rent Mr. Chopra has to pay for a year is Rs 48000.