Ratio, Proportion and Percentages Puzzle – Challenge 28
This is a great math and critical thinking challenge to strengthen a child's grasp of math concepts in a fun way.
Challenge:
During last three years, the price of a car is reduced by \(10\%\) in the first year, \(20\%\) in the second year, and \(25\%\) in the third year. What percent of the original price is the total reduction of the car’s price?
A- \(36\%\)
B- \(40\%\)
C- \(46\%\)
D- \(54\%\)
E- \(55\%\)
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The correct answer is C.
Choose x for current price of the car. In the first year, the price of the car reduced to \(0.90 x\). Next year, it’ll be
\(0.90x × 0.80 = 0.72x\).
For the third year, the price of the car is: \(0.72x × 0.75 = 0.54 x\)
Therefore, \(46\%\) of the original price is the total reduction of the car’s price.
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