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What is the result of 15% of 800 + 20% of 500?
200
220
240
260
220
Use the 10% rule: 10% of 800 is 80, so 15% is 80+40=120. 20% of 500 is simply double of 10% (50), which is 100. Adding these mentally gives 120+100=220.
We are given two expressions to evaluate: 15% of 800 and 20% of 500.
Value=(100xтАЛ├Чy)+(100zтАЛ├Чw)
Use the 10% rule: 10% of 800 is 80, so 15% is 80+40=120. 20% of 500 is simply double of 10% (50), which is 100. Adding these mentally gives 120+100=220.
Many students miscalculate 15% of 800 by confusing the decimal point or attempting long multiplication instead of using the base-100 property.
Calculate first percentage
To find 15% of 800, we write it as 0.15├Ч800.
10015тАЛ├Ч800=15├Ч8=120
Calculate second percentage
To find 20% of 500, we write it as 0.20├Ч500.
10020тАЛ├Ч500=20├Ч5=100
Sum the results
Finally, add the two calculated values together.
120+100=220
B is correct because the sum of 120 and 100 equals 220.
Mastering mental percentage calculation (like 10% and 5% splits) significantly speeds up Data Interpretation (DI) sections in competitive exams.
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