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A number is mistakenly divided by 2 instead of being multiplied by 2. Find the percentage change in the result due to this mistake.

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Important Questions on Percentages

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Sachin wanted to subtract 10 from a number. Unfortunately, he added 10 instead of subtracting. Find the percentage change in the result.
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In a mixture of 100 litres of milk and water, 25% of the mixture is milk. How much water should be added to the mixture, so that milk becomes 20% of the mixture?
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A landowner increased the length and the breadth of a rectangular plot by 20% and 30% respectively. Find the percentage change in the cost of the plot, assuming land prices are uniform throughout his plot.
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The height of a triangle is increased by 30%. What can be the maximum percentage increase in length of the base, so that the increase in area is restricted to a maximum of 90%?
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The length, breadth and height of a room in the shape of a cuboid are increased by 10%, 20% and 50% respectively. Find the percentage change in the volume of cuboid.
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The salary of Ajay is 10% more than that of Vivek. Find by what percentage is the salary of Vivek less than that of Ajay?
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The price of salt is reduced by 50% but, inspite of the decrease, Aayush ends up increasing his expenditure on salt by 50%. What is the percentage change in his monthly consumption of salt?
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The price of wheat falls by 20%. How much wheat can be bought now with the money that was sufficient to buy 100 kg of rice previously?