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What is the result of 15% of 400 + 20% of 250?
100
110
120
130
110
Use the '10% rule': 10% of 400 is 40, so 15% is 40 + 20 = 60. 10% of 250 is 25, so 20% is 25 * 2 = 50. Total = 60 + 50 = 110.
We are given the percentage calculation problem: 15% of 400 and 20% of 250.
Value=(100PтАЛ├ЧX)+(100QтАЛ├ЧY)
Use the '10% rule': 10% of 400 is 40, so 15% is 40 + 20 = 60. 10% of 250 is 25, so 20% is 25 * 2 = 50. Total = 60 + 50 = 110.
Students often calculate the percentages incorrectly by mistakenly multiplying the numbers directly without dividing by 100.
Calculate 15% of 400
To find 15% of 400, convert the percentage to a fraction and multiply: 15/100├Ч400.
10015тАЛ├Ч400=60
Calculate 20% of 250
To find 20% of 250, convert the percentage to a fraction and multiply: 20/100├Ч250.
10020тАЛ├Ч250=50
Sum the results
Add the two calculated values to find the final result.
60+50=110
B is correct because the sum of 15% of 400 (60) and 20% of 250 (50) equals 110.
Understanding how to quickly break down percentages using base-10 (10% and 1%) is essential for Data Interpretation questions in competitive exams.
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