Answer: The cost price for Hari is 840 RS,
The cost price for Ram is 800 Rs
Step-by-step explanation: We start by working back with the profit made by Hari which is given as RS 882. What this means is that after selling the camera Ram has RS 882 which is made up of the cost price plus the profit or we can denote this figure as 105%.
To compute the extra 5% on 882, we can write out the following expression
882/x = 105/100
Where 882 is the cost price plus the 5% profit and x is the cost price. Hence 882/x = 105/100
By cross multiplication we now have
882 × 100 = 105x
88200 = 105x
Divide both sides of the equation by 105
840 = x
The cost price for Hari is Rs 840. That means Ram sold it at RS 840 and made a 5% profit. We shall adopt a similar approach to calculate Ram's cost price, which is
840/y = 105/100
Where 840 is the cost price plus the 5% profit and y is the cost price
Hence 840/y = 105/100
By cross multiplication we now have
840 × 100 = 105y
84000 = 105y
Divide both sides of the equation by 105
800 = y
The cost price for Ram is Rs 800.
is 
. (This eliminates B and D)
, then 
". This means the answer must be A.