By Pathantu · Published 6 October 2026 · Original practice, not PYQ
Method
Check the unit. Counts cannot give revenue without prices.
Mark the requested base: a shop, a product or the entire table. Add only the required cells.
Overall percentage = total relevant count ÷ total base ×100. Do not average percentages from unequal bases.
Six questions: try first, then open the solution
1. Find B’s total sales count.
Show worked solution
150+100=250 items.
2. What percent of A’s sales were notebooks?
Show worked solution
120/(120+80)×100=60%.
3. Find total notebooks : total pens.
Show worked solution
360:290 = 36:29.
4. Find average pens per shop.
Show worked solution
(80+100+110)/3=96⅔. An average count may be fractional.
5. By what percent is B’s notebook count greater than C’s?
Show worked solution
(150−90)/90×100=66⅔%. Use C as the base.
6. X has 100 items with 10% defects; Y has 300 with 2%. Find the combined defect rate.
Show worked solution
Defects=10+6=16 out of 400. Overall=4%, not the unweighted average 6%.
Check your reasoning
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- Percentages: choose the correct base
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