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Solve: 12.5% of 800 + 20% of 500
200
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200
Use standard fraction equivalents: remember that 12.5%=81тАЛ and 20%=51тАЛ to calculate mentally in seconds.
Expression to evaluate: 12.5% of 800 + 20% of 500
Value=(100p1тАЛтАЛ├Чn1тАЛ)+(100p2тАЛтАЛ├Чn2тАЛ)
Use standard fraction equivalents: remember that 12.5%=81тАЛ and 20%=51тАЛ to calculate mentally in seconds.
Miscalculating decimal placements or misinterpreting the percentage as a direct multiplication without dividing by 100.
Convert first percentage part
Convert 12.5% to its fraction form 81тАЛ and multiply by 800.
12.5%┬аof┬а800=81тАЛ├Ч800=100
Convert second percentage part
Convert 20% to its fraction form 51тАЛ and multiply by 500.
20%┬аof┬а500=51тАЛ├Ч500=100
Add both values
Sum the results from both terms to find the final value.
100+100=200
A is correct because 12.5% of 800 is 100 and 20% of 500 is 100, resulting in a total sum of 200.
Quickly recognizing common fraction-percentage equivalents is essential for saving time in speed-based railway and banking exams.
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