Equate quantities

To compare prices directly, make the number of oranges equal by taking the LCM of 10 and 8, which is 40.

$LCM(10, 8) = 40$

Calculate Cost Price (CP) for 40 oranges

Since 10 oranges cost Rs. 25, 40 oranges (which is $4 \times 10$) cost $4 \times 25 = 100$.

$CP = 100$

Calculate Selling Price (SP) for 40 oranges

Since 8 oranges sell for Rs. 25, 40 oranges (which is $5 \times 8$) sell for $5 \times 25 = 125$.

$SP = 125$

Calculate Profit Percentage

Apply the profit percentage formula using $CP = 100$ and $SP = 125$.

$\text{Profit} \% = \frac{125 - 100}{100} \times 100 = 25\%$