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Name: ___________________________ Per: _______ Date: ______________ State Test Review Day 6: Percents and Interest: Extended Response Part % = Whole 100 1) Sales tax and discounts… Find the final cost of a $45 shirt and a $52 pair of pants that are both on sale for 30% off with a tax of 7.5%. 2) When trying to find percent increase or percent decrease, use the formula… Amount of increase or decrease Original Amount In 2004 there were 520 8th Graders in Highlands. In 2005, there were only 470 8th Graders in Highlands. Find the percent of change in the number of students at Highlands. 3) The formula for simple interest is… I = prt Interest = (Principal)(rate)(time) Tara borrowed $5500 from her bank for 3 years at an interest rate of 9.9%. Part A: How much interest did she have to pay on the money she borrowed? Part B: How much money did she have to pay back in all after her 3 year loan period was up? Open-Ended Questions – Use a CALCULATOR!!!!!!!!!!!!! 1) A house originally selling for $425,000 2) Julio put $40,000 into a bank account that has been discounted to $385,000. What is had a 3% yearly interest rate. If he the percent decrease in the selling price accumulated $4800 in interest, how long has of the house? the money been in the bank? Use the formula I = PRT 3) What would the final price of a $189.99 lawnmower be after a 15% discount and 6% tax? 4) 5) The toll on the TappenZee Bridge is now $5.00. In July, the toll is going to be increased by 20%. What will be the new toll after the 20% increase? 6) Rob wants to buy an MP3 player. The regular price of the MP3 player is $209.00. The sale price of the player is 30% off of the regular price. a. What is the sale price of the MP3 player? b. Rob must pay 8.25% sales tax on his purchase. What is the total amount that Rob must pay for the MP3 player? 7) The cost of a DVD at Best Buy increased from $15.99 to $16.29. Find the percent increase to the nearest tenth of a percent. 8) A sample of rock weighing 400 grams contains 3 grams of iron. What percent of the rock is iron?
