Concept: The question tests on fundamentals of P/L(Profit/Loss)
The price on any goods before selling it is called the Marked price or Label price.
Let the Marked price on each toy = x. Therefore the total MP = 12x
SP of a toy sold at 20% discount = 0.8x.
SP of 8 toys = 0.8x * 8 = 6.4x
SP of a toy sold at an additional 25% discount = 0.8x * 0.75 = 0.6x.
SP of 4 Toys = 4 * 0.6x = 2.4x
Total SP = 6.4x + 2.4x = 8.8x = 2112
Therefore x = 240
Total MP = 12 * 240 = 2880
Now the profit is 10%. Therefore CP * 110/100 = 2112
CP = 2112∗100/110=1920
When there is no discount MP = SP = 2880
Profit% = SP−CP/CP∗100=2880−1920/1920∗100=50