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Three tables are purchased for Rs.2500 each. First is sold at a profit of 8%, the second is sold at a loss of 3%. If their average selling price is Rs.2575, find the profit percent on the third.

Answer
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Hint: The given problem is based on profit and loss concept; in this problem we can find profit percentage using the formula (profitcp)×100and to find the selling price of first two tables we can make use of the formula sp=(100+profit%100)×cp and sp=(100loss%100)×cp as per the requirement of the problem.

Complete step by step solution:
Given The cost of 1 table = Rs.2500.
Then, the Cost price of the three tables = Rs. 2500×3=7500
Given The average Selling price of the 3 tables = Rs. 2575.
 Then, the total Selling price = Rs. 2575×3=7725
Now we have to calculate selling price of the first table using the formula sp=(100+profit%100)×cp
given The Selling price of the first table at 8% profit by using above formula
we get =(100+8100)×2500
The Selling price of the first table=2700 Rs
Now we have to calculate selling price of the first table using the formula sp=(100loss%100)×cp
given The Selling price of the second table at 3% loss by using above formula
we get =(1003100)×2500
The Selling price of the second table=2425 Rs
Then, the sum of the Selling price of two tables = (2700+2425)=5125
So, the Selling price of the third table = The total of the Selling price − the sum of the Selling price of two tables
=(77255125)=2600Rs
Profit on the third tables =(26002500)=100Rs
=1002500×100%
=1002500×100%=4%
=4%
 Therefore, profit percent on third table is 4%
So, the correct answer is “ 4%”.

Note: To solve the above problem we have used the direct formula along with unitary method (if the value of one unit is given then multiply the value of a single unit to the number of units to get necessary value) where ever necessary because as in the problem cost of each table is given.
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