Let the cost price be x. Selling Price = x - (25% of x) = 0.75x. Therefore, 0.75x = $75, x = $75 / 0.75 = $100.

Let the cost price be x. Selling Price = Cost Price + Profit = x + 0.25x = 1.25x. Setting this equal to $250 gives 1.25x = $250, so x = $250 / 1.25 = $200.

Let the cost price be x. Selling Price = x + 30% of x = 1.3x. Thus, 1.3x = 130, so x = 100.

Let the original price be x. Selling Price = x - (20% of x) = 0.80x. Thus, 0.80x = $240, so x = $240 / 0.80 = $300.

Let the original price be x. Then, Selling Price = x - (25% of x) = 300 => 0.75x = 300 => x = 400.

Let the original price be x. After a 30% discount, the selling price is 0.70x. Setting this equal to $300 gives 0.70x = $300, so x = $300 / 0.70 = $428.57, which rounds to $400.

The increase in price is $180 - $150 = $30. The percentage increase is ($30 / $150) * 100 = 20%.

Let the original price be $100. After a 15% increase, the price is $115. After a 15% decrease, the price is $115 - (15% of $115) = $115 - $17.25 = $97.75. The net change is ($97.75 - $100) / $100 * 100% = -2.25%.

The ratio of flour to sugar is 2:3. If you have 6 cups of sugar, then the amount of flour needed is (2/3) × 6 = 4 cups.

Using the ratio 3:2, if 3 cups of flour require 2 cups of sugar, then 12 cups of flour will require (2/3) × 12 = 8 cups of sugar.

Half of 40% of a cup is 20% of a cup. Therefore, you need 0.2 cup of sugar.

Flour needed = 40% of 2000g = 0.4 * 2000 = 800g.

The ratio of flour to sugar is 4:1. If you have 8 cups of flour, the amount of sugar needed is (8 cups flour * 1 sugar) / 4 flour = 2 cups of sugar.

The ratio of sugar to flour is 1:4. If you have 200 grams of flour, then the amount of sugar needed is (1/4) * 200 = 50 grams.

Let the width be w. Then the length is 2w. The perimeter P = 2(length + width) = 2(2w + w) = 6w. Setting this equal to 48 gives 6w = 48, so w = 8 cm.

Profit = Selling Price - Cost Price = $360 - $300 = $60. Profit Percentage = (Profit / Cost Price) * 100 = ($60 / $300) * 100 = 20%.

Profit = Selling Price - Cost Price = $150 - $120 = $30. Profit Percentage = (Profit/Cost Price) * 100 = ($30/$120) * 100 = 25%.

Profit = Selling Price - Cost Price = 360 - 300 = 60. Profit Percentage = (Profit/Cost Price) * 100 = (60/300) * 100 = 20%.

The selling price is calculated as $120 + (15% of $120) = $120 + $18 = $138.

Selling Price = Cost Price + Profit = 150 + (25% of 150) = 150 + 37.5 = $187.5.

Profit = Selling Price - Cost Price = 180 - 150 = 30. Profit Percentage = (30/150) * 100 = 20%.

Selling Price = Cost Price + Profit = $300 + ($300 * 0.15) = $300 + $45 = $345.

Let the original price be x. After a 10% discount, the selling price is x - (0.10 * x) = 0.90x. Setting this equal to $300 gives 0.90x = $300, so x = $300 / 0.90 = $333.33.

Selling Price = Cost Price - Loss = 800 - (10% of 800) = 800 - 80 = $720.

Selling Price = Marked Price - Discount = 200 - (15% of 200) = 200 - 30 = $170.

The selling price after a 20% discount on $200 is $200 - ($200 * 0.20) = $200 - $40 = $160.

Discount = 10% of 500 = 50. Selling Price = Marked Price - Discount = 500 - 50 = $450.

Let the marked price be x. Then, 300 = x - 25% of x => 300 = x - 0.25x => 300 = 0.75x => x = 400.

Let the original price be x. After a 20% discount, the selling price is 80% of x. Thus, 0.8x = 30. Solving for x gives x = 30/0.8 = 37.5. Therefore, the original price is $36.

Let the original price be x. After a 25% discount, the selling price is x - 0.25x = 0.75x. Setting this equal to $30 gives 0.75x = 30, so x = 30/0.75 = $40.