A product originally costs $125.If the product goes on sale for 20% off, and then goes on sale for an additional 30% off, what is the price of the product?
Answer(s): B
You need to apply the discounts successively not just add the discounts. So $125 × 80% = $100 (price after original 20% discount). $100 × 70% = $70 the price after the 2nd 30% discount.
A digital video recorder is programmed to record a TV show that lasts for a half hour.If the digital video recorder has enough memory left to hold 180 minutes of recording, what percentage of the remaining capacity is used for this recording?
Answer(s): A
A half-hour is 30 minutes.The portion of 180 minutes represented by 30 minutes is 30/180 or 1/6. As a percentage, 1/6 is 162/3%.
On a trip to the beach you travel 200 miles in 300 minutes. How fast did you travel?
First convert the 300 minutes to hours by dividing by 60 (300 ÷ 60 = 5 hours). Use the distance formula (d = rt) and substitute the known values. 300 = 5r. r = 40.
21 students, or 60% of the class, passed the final exam. How many students are in the class?
Answer(s): C
Let x = the number of people in the class. 60% of x = 21, so 0.60x = 21.x = 35.
Joan invests $4,000 in an account that earns 3% simple interest. How much will Joan have in the account in 10 years?
Use the interest formula (I = Prt) to determine the amount of interest earned, where the principle (P) is 4,000, the rate (r) is 0.03 (3%) and the time (t) is 10. I = 4,000(0.03)(10), or I = $1,200. Add the interest earned to the original amount invested. $4,000 + $1,200 = $5,200.
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