% question

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tj123: Senior | Next Rank: 100 Posts; Posts: 85; Joined: Mon Dec 08, 2008 12:09 am

by tj123 » Sun Feb 08, 2009 11:10 pm

A certain candy bar manufacturer reduced the weight of Candy Bar M by 20% but left the price unchanged. What was the resulting % increase in the price per ounce of Candy Bar M?

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Answer is 25

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Source: Beat The GMAT — Problem Solving | Sun Feb 08, 2009 11:10 pm

Alara533: Senior | Next Rank: 100 Posts; Posts: 73; Joined: Wed Jan 28, 2009 9:00 am; Thanked: 6 times; GMAT Score:680

by Alara533 » Sun Feb 08, 2009 11:32 pm

Suppose the cost for 100 ounce of candy bar was X.
Which means cost for 1 ounce = X/100

Since the weight was reduced by 20% and priced remained same, now 80 ounce of candy bar costs X. i.e cost of 1 ounce is X/80.

Now % increase is given [(X/80) - (X/100)] / (X/100) = 0.25 = 25%

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sureshbala: Master | Next Rank: 500 Posts; Posts: 319; Joined: Wed Feb 04, 2009 10:32 amFollowed by: 9 members; Location: Delhi; Thanked: 84 times

by sureshbala » Mon Feb 09, 2009 3:11 am

Some quick calculation.....

Earlier if 100 ounces cost 100$, now 80 ounces cost 100$. So as per the present price 100 ounces will cost 125$. So the percentage increase is 25%

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