Last year, oranges were available at ₹ 24 per dozen; but this year, they are available at ₹ 50 per score. Find the percentage change in the price of oranges. [1 score = 20]

Last year, cost of oranges = ₹ 24 per dozen

Cost of one orange = ₹ $\dfrac{24}{12}$ = ₹ 2

This year, cost of oranges = ₹ 50 per score

Cost of one orange = ₹ $\dfrac{50}{20}$ = ₹ 2.5

Change in price = ₹ (2.5 - 2) = ₹ 0.5

Change in price is positive means price of oranges has increased.

Percentage increase = $\dfrac{\text{Change in price}}{\text{Cost of orange last year}} \times 100$ %

= $\dfrac{0.5}{2} \times 100$ %

= $\dfrac{50}{2}$ %

= $25$ %

Hence, percentage change in the price of orange = 25% increase.