Ratio,Proportion, Percentages and Discounting Q.21

21If the price of potatoes increased first by 20% and subsequently by 40%, then what is the final price per kilogram if the original price was Rs 25 per kg?

Option : B
Explanation : Using the formula: x + y + xy/100, net percentage increase = 20 + 40 + (20 × 40)/100 = 68%
Increased price = Rs 25 + 68% of 25 = 25 + 17 = Rs 42
Alternatively: Using the multiplier factor concept, we get the final price as 25 ×[6/5]x[7/5]=Rs 42

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