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Combinations and Simple Interest Math Lesson

Learn how to tackle combination problems involving multiple percentages and find total amounts after applying discounts and taxes. Understand the concept of Simple Interest and calculations using the formula I=PRT.

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Combinations and Simple Interest Math Lesson

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  1. Combinations and Simple Interest Mrs. Kuznia Math 8 Day 15

  2. Rule • Sometimes, we have to apply more than one percent to a given problem. • IE: Tax, then tip • Sale price, than tax

  3. Rule Continues • NO MATTER WHAT….NEVER add the percents together. • To do combination problems, you must apply the first percent, then apply the second. • IE, Find the sale price first, THAN add the tax to it.

  4. Example • You buy a $3500 Used car, that has been discounted 10%, but you must pay tax of 8%.What is the total amount you pay?

  5. Example • You got to Fresno’s and your bill comes to $37.50. You must pay and 4% tax, then leave an 8% tip. What is the total amount you pay?

  6. Example • You buy new TV for $259.99. It is on sale 25% off, and you must pay 8.25% tax. How much do you pay?

  7. Example • You shop at JC Penny’s and you buy a pair or pants for $59.99, that is on sale 20% off. You also have a coupon that gives you an extra 25% off. How much do you pay?

  8. Simple Interest • Simple Interest deals with Money. When you put money into the bank, you are able to earn a certain percent of that money depending on how much you put in, and how long you keep it there

  9. Formula • I=P R T • I- Interest • P-Principal (starting Amount) • R-Rate (change to decimal) • T- time in years

  10. Example • Find the Simple Interest: • Principal= 16,425 • Rate= 5% • Time = 8 years

  11. Examples • Principal=$850 Principal = $1,659 • Rate = 9% Rate = 5% • Time = 12 years Time = 5 years

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