Question:
Kamal bought a house, whose sale price was Rs. 8 lakh. He availed 20% discount as an early bird offer and then 10% discount due to cash payment. After that he spent 10% of the cost price in interior decoration and lawn of the house. At what price should he sell the house to earn a profit of 25%?

Option A):
Rs. 7 lakh
Option B):
Rs. 9 lakh
Option C):
Rs. 7.99 lakh
Option D):
Rs. 7.92 lakh

Correct Answer is Option D):
Rs. 7.92 lakh

Explanation:
Let the marked price be 100.
100 == 20% ↓(discount)==> 80 == 10% ↓(discount)==> 72(CP) == 10% ↑(interior)==> 79.2(Total CP)
Now, selling price would be 25% above the Total cost price.
SP = 79.2 + 25% of 79.2
SP = 99
Now, On comparing,
100 ==> 800000
99 ==> (800000/100) *99 ==> 7, 92,000
So,
SP = Rs. 7, 92, 000.