Final answer:
To find the Cost Price (C.P.), we need to consider the loss percentage and the Selling Price (S.P.). By substituting the given values into the formula C.P. = S.P. + Loss, we can calculate the Cost Price (C.P.) to be Rs 891.
Step-by-step explanation:
To find the Cost Price (C.P.), we need to consider the loss percentage and the Selling Price (S.P.). Let's start by converting the loss percentage to decimal form. We know that the loss percentage is 10%, which can be written as 0.10.
We can use the formula S.P. = C.P. - Loss to find the Cost Price. Rearranging the formula, we have C.P. = S.P. + Loss.
Substituting the given values, we get C.P. = 810 + (0.10 * 810). Calculating this, the Cost Price (C.P.) is Rs 891. Therefore, option D) Rs 900 is the correct answer.