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Explanation The question states that there were originally 250 ducks, but now there are only 220 ducks remaining. To find the percentage of ducks that died, we need to calculate the difference between the original number of ducks and the remaining number of ducks.
250 - 220 = 30
Then, we divide the difference by the original number of ducks and multiply by 100 to get the percentage.
Explanation The question states that if the selling price of the water bottle is 200 baht, the profit will be 25%. To find the cost price, we need to calculate 25% of 200 baht, which is 50 baht. To find the cost price, we subtract the profit from the selling price: 200 baht - 50 baht = 150 baht. Therefore, the cost price of the water bottle is 150 baht.
Explanation If Jira deposits 1,200 baht in a bank with an interest rate of 15% per year, the interest earned in 6 months would be half of the annual interest. Therefore, the interest earned in 6 months would be 7.5% (15% divided by 2) of 1,200 baht, which is 90 baht.
Explanation The profit percentage can be calculated by subtracting the cost price from the selling price, dividing the result by the cost price, and then multiplying by 100. In this case, the cost price is 4,000 baht and the selling price is 5,400 baht. Therefore, the profit is 5,400 - 4,000 = 1,400 baht. To find the profit percentage, we divide the profit by the cost price (1,400 / 4,000) and multiply by 100. The result is 0.35, which is equivalent to 35%.
Explanation The bank gives an interest of 896 baht on a deposit of 11,200 baht after 1 year. To find the interest rate, we divide the interest by the principal and multiply by 100. So, (896/11,200) * 100 = 8. Therefore, the bank calculates the interest rate as 8%.
Explanation The salesperson received a 5% commission on the selling price of the product. If the total sales amount was 60,000 baht, the commission received by the salesperson would be 5% of 60,000 baht, which is equal to 3,000 baht.
Explanation The question states that the selling price of a product is set 20% higher than the cost price, but then a 5% discount is given to the buyer. To calculate the profit percentage, we need to find the difference between the selling price and the cost price, and then divide it by the cost price.
Let's assume the cost price is 100 units. The selling price would be 120 units (20% higher than the cost price). After a 5% discount, the buyer pays 114 units.
The profit would be the difference between the selling price and the cost price, which is 20 units (120 - 100).
To find the profit percentage, we divide the profit by the cost price and multiply by 100: (20/100) * 100 = 20%.
Explanation The profit percentage can be calculated by finding the difference between the selling price and the cost price, dividing it by the cost price, and then multiplying by 100. In this case, the cost price of 5 limes is 4 baht and the selling price is 5 baht. The profit is 5 - 4 = 1 baht. The profit percentage is (1/4) * 100 = 25%. However, since the question asks for the profit percentage for each lime, we need to divide the profit percentage by the number of limes sold, which is 4. Therefore, the profit percentage for each lime is 25% / 4 = 6.25%.
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Explanation The question states that the merchant sells shirts at a loss of 20% when they are priced at 120 baht each. To make a profit of 20%, the merchant needs to increase the selling price by 20% of the cost price. Therefore, the selling price per shirt should be 120 + (20% of 120) = 120 + 24 = 144 baht. However, this is not the correct answer given. If the correct answer is 180 baht, it suggests that there may be an error or inconsistency in the question or answer choices.