A stockiest wants to make some profit by selling sugar. He contemplates about various methods. Which of the following would maximize his profit?
i. Sell sugar at 10% profit.
ii. Use 900 g of weight instead of 1 kg.
iii. Mix 10% impurities in sugar and selling sugar at cost price.
iv. Increase the price by 5% and reduced weights by 5%.

Explanation:-

Let the CP of 1 kg of sugar be Rs. 100.
Then, CP of 900g sugar = (100*900)/1000 = Rs. 90
Hence, profit % = [(100-90)/90]*100 = 11.11%.

If he add 10% impurity then his CP for 1 kg = (100*1000)/1100 = Rs. 90.9;
And % profit = [(100-90.9)/90.9]*100 = 10.01%

If he reduces weight by 5 % Then, cost price of 950 g = (100*950)/1000 = Rs 95 and SP = 105;
% profit = [(105-95)/95]*100 = 10.25 %.