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Calculate: 15% of 400 + 20% of 650.
180
190
200
210
190
Use fractional equivalents: 15% is 203тАЛ of 400 (which is 60) and 20% is 51тАЛ of 650 (which is 130).
Expressions to evaluate: 15% of 400 and 20% of 650
extPercentage=100xтАЛimesextBase
Use fractional equivalents: 15% is 203тАЛ of 400 (which is 60) and 20% is 51тАЛ of 650 (which is 130).
Miscalculating the multiplication of decimals or fractions, leading to basic arithmetic errors.
Calculate first percentage
Evaluate 15% of 400 by converting the percentage to a fraction and multiplying by 400.
rac15100imes400=60
Calculate second percentage
Evaluate 20% of 650 by converting 20% to 51тАЛ and multiplying by 650.
rac20100imes650=130
Combine both results
Add the two calculated values to find the final total.
60+130=190
B is correct because the sum of 15% of 400 (60) and 20% of 650 (130) equals 190.
Fast percentage calculation is a core pillar for tackling complex Data Interpretation charts and arithmetic problems in CBT exams.
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