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百分率增减・折扣与复合变化挑战
The result of increasing the quantity x by 400% is 60. What is the value of x?
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百分率增减・折扣与复合变化进阶
A scientist studying the life cycle of dragonflies counted the number of dragonflies in a certain habitat each day for 46 days. On February 15, there were 99 dragonflies in the habitat. The percent increase in the number of dragonflies in the habitat from January 1 to February 15 was 12.50%. How many dragonflies were in the habitat on January 1?
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百分率增减・折扣与复合变化挑战
A business owner plans to purchase the same model of chair for each of the 81 employees. The total budget to spend on these chairs is $14,000, which includes a 7% sales tax. Which of the following is closest to the maximum possible price per chair, before sales tax, the business owner could pay based on this budget?
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百分率增减・折扣与复合变化挑战
A certain product costs a company $65 to make. The product is sold by a salesperson who earns a commission that is equal to 20% of the sales price of the product. The profit the company makes for each unit is equal to the sales price minus the combined cost of making the product and the commission. If the sales price of the product is $100, which of the following equations gives the number of units, u, of the product the company sold to make a profit of $6,840 ?
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百分率增减・折扣与复合变化挑战
The Townsend Realty Group invested in the five different properties listed in the table above. The table shows the amount, in dollars, the company paid for each property and the corresponding monthly rental price, in dollars, the company charges for the property at each of the five locations. Townsend Realty purchased the Glenview Street property and received a 40% discount off the original price along with an additional 20% off the discounted price for purchasing the property in cash. Which of the following best approximates the original price, in dollars, of the Glenview Street property?
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百分率增减・折扣与复合变化挑战
A business owner plans to purchase the same model of chair for each of the 81 employees. The total budget to spend on these chairs is $14,000, which includes a 7% sales tax. Which of the following is closest to the maximum possible price per chair, before sales tax, the business owner could pay based on this budget?
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百分率增减・折扣与复合变化挑战
The number w is 110% greater than the number z. The number z is 55% less than 50. What is the value of w?
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百分率增减・折扣与复合变化挑战
A gift shop buys souvenirs at a wholesale price of 7.00 dollars each and resells them each at a retail price that is 290% of the wholesale price. At the end of the season, any remaining souvenirs are marked at a discounted price that is 80% off the retail price. What is the discounted price of each remaining souvenir, in dollars?
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百分率增减・折扣与复合变化挑战
The value of a collectible comic book increased by 167% from the end of 2011 to the end of 2012 and then decreased by 16% from the end of 2012 to the end of 2013. What was the net percentage increase in the value of the collectible comic book from the end of 2011 to the end of 2013?
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百分率增减・折扣与复合变化挑战
The manager of an online news service received the report above on the number of subscriptions sold by the service. The manager estimated that the percent increase from 2012 to 2013 would be double the percent increase from 2013 to 2014. How many subscriptions did the manager expect would be sold in 2014?
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百分率增减・折扣与复合变化挑战
he line graph shows the total amount of snow, in inches, recorded each year in Washington, DC, from 2003 to 2015. If p% is the percent decrease in the annual snowfall from 2003 to 2007, what is the value of p ?
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百分率增减・折扣与复合变化挑战
The number a is 70% less than the positive number b. The number c is 80% greater than a. The number c is how many times b ?
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