Reference : Percentage
Q1. A shopkeeper marks up an item by 20% and then offers a 15% discount. If the original cost is $500, what is the final selling price?
$550
$510
$530
$480
Q2. A city's population changes as follows: First, it increases by 25%, then decreases by 20%. If the original population was 80,000, what is the final population?
78,000
76,000
77,000
75,000
Q3. A trader buys goods for $800 and sells them at a profit of 25%. Later, he incurs a loss of 10% on the selling price. What is the final selling price?
$1,050
$950
$1,000
$900
Q4. A solution contains 40% acid. How much pure water must be added to reduce the concentration to 20%?
80% of original volume
60% of original volume
70% of original volume
50% of original volume
Q5. A person's income is $60,000 with tax rates: 10% for first $20,000, 15% for next $20,000, and 20% for remaining amount.
$9,000
$11,000
$12,000
$10,000
Q6. A alloy contains 40% copper, 30% zinc, and 30% nickel. If 250 grams of the alloy is melted, how much copper will be extracted?
110 grams
90 grams
100 grams
80 grams
Q7. An item's price changes as follows: 10% increase, then 5% decrease, then another 15% increase.
22.5% increase
20.5% increase
21.5% increase
19.5% increase
Q8. An investment of $5,000 grows at 8% compound interest for 2 years.
$5,720
$5,800
$5,750
$5,832
Q9. A machine's measurement has an error of ±3%. If a measurement reads 500 units, what is the range of actual value?
490 to 510 units
475 to 525 units
485 to 515 units
470 to 530 units
Q10. A 40% acid solution is diluted by adding water. After dilution, the concentration becomes 10%.
90% water added
80% water added
85% water added
75% water added
Other References :
AP & GP : Link
Area : Link
Average : Link
Boat & Stream : Link
Compound Interest : Link
Height & Distance : Link
LCM & HCF : Link
Logarithm : Link
Profit & Loss : Link
Ratio & Proportion : Link
Simple Interest : Link
Speed Distance : Link
Time & Work : Link
Trains Problem : Link
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