Question: In May, John bought the same amount of rice and the same amount of wheat as he had bought in April, but spent ₹ 150 more due to price increase of rice and wheat by 20% and 12%, respectively. If John had spent ₹ 450 on rice in April, then how much did he spend on wheat in May?
John spent Rs. 450 on rice in April hence he will spend 450 × 1.2 = 540 on rice in May.
He spends Rs. 90 extra on rice.
He also spends a total of Rs. 150 more in May compared to April
⇒ He spends 150 – 90 = Rs. 60 more on wheat in May compared to April.
∴ His expenditure on wheat in April on wheat = 60/0.12 = Rs. 500.
⇒ His expenditure on wheat in May = 500 + 60 = Rs. 560.
Hence, option (b).