Q. A country plans to increase its national park area by 15% each year. If the current area is 200 square kilometers, what will be the area after 1 year? (2023)
A.
230
B.
240
C.
250
D.
260
Solution
Area after 1 year = 200 * 1.15 = 230 square kilometers.
Q. A country plans to reduce its carbon emissions by 10% each year. If the current emissions are 500 tons, what will be the emissions after 1 year? (2022)
A.
450 tons
B.
400 tons
C.
500 tons
D.
550 tons
Solution
Emissions after 1 year = 500 - (10% of 500) = 500 - 50 = 450 tons.
Q. A country signed a treaty that will reduce its carbon emissions by 30%. If its current emissions are 2 million tons, what will be the new emissions after the reduction?
A.
1.4 million tons
B.
1.5 million tons
C.
1.6 million tons
D.
1.7 million tons
Solution
New emissions = Current emissions - (30% of Current emissions) = 2 million tons - (0.3 * 2 million tons) = 1.4 million tons.
Q. A current-carrying conductor experiences a force in a magnetic field. What is the direction of this force? (2020)
A.
Parallel to the field
B.
Opposite to the field
C.
Perpendicular to both current and field
D.
In the direction of current
Solution
According to Fleming's left-hand rule, the force on a current-carrying conductor in a magnetic field is perpendicular to both the current and the magnetic field.
Correct Answer:
C
— Perpendicular to both current and field
Q. A customer buys a laptop for $800 after a discount of 20%. What was the marked price?
A.
$1000
B.
$900
C.
$850
D.
$800
Solution
Let the marked price be x. After a 20% discount, the selling price is 0.80x. Setting this equal to $800 gives 0.80x = $800, so x = $800 / 0.80 = $1000.
Q. A customer buys three items priced at $50, $70, and $80. If a discount of 15% is applied to the total bill, what is the amount saved due to the discount?
Q. A customer buys two items for $120 each. If the first item has a profit margin of 25% and the second has a loss of 25%, what is the overall profit or loss?
A.
$0
B.
$10 profit
C.
$10 loss
D.
$20 profit
Solution
Cost Price of first item = 120 / 1.25 = $96; Cost Price of second item = 120 / 0.75 = $160. Total Cost Price = 96 + 160 = $256; Total Selling Price = 240. Loss = 256 - 240 = $16.
Q. A customer buys two items for $120 each. If the first item has a profit of 20% and the second has a loss of 20%, what is the overall profit or loss? (2023)
A.
No profit, no loss
B.
Loss of $12
C.
Profit of $12
D.
Profit of $24
Solution
Cost Price of first item = 100, Selling Price = 120. Cost Price of second item = 150, Selling Price = 120. Total Cost Price = 250, Total Selling Price = 240. Overall loss = 10.
Q. A customer buys two items for $120 each. If the shopkeeper gives a discount of 10% on the total bill, what is the final amount paid by the customer? (2023)
A.
$216
B.
$220
C.
$240
D.
$250
Solution
Total cost before discount = 2 * $120 = $240. Discount = 10% of $240 = $24. Final amount = $240 - $24 = $216.
Q. A customer buys two items for $240 after a discount of 10% on each. What was the total marked price of the items?
A.
$250
B.
$260
C.
$270
D.
$280
Solution
Let the total marked price be x. After a 10% discount, the selling price is 0.90x. Setting this equal to $240 gives 0.90x = $240, so x = $240 / 0.90 = $266.67, which rounds to $280.
