Warmups A tree casts a shadow 8 feet long. At the same time, a flagpole 10 feet tall casts a shadow 15 feet long. How tall is the tree? Find I, if p.

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Presentation transcript:

Warmups A tree casts a shadow 8 feet long. At the same time, a flagpole 10 feet tall casts a shadow 15 feet long. How tall is the tree? Find I, if p = $950, r = 9%, t = 6 months Find r, if I = $912, p = $7600, t = 4 years

4-5 Percent of Change Objective: To solve problems involving percent of increase or decrease.

Percent of Change Percent Increase: new amount/price goes up Percent Decrease: new amount/price goes down Example 1: Mac reduced the price of the nano ipod from $179 to $139. What is the percent decrease? Amount of decrease = _x_ Original # 100 (Big # - small #)

Another method  You can also divide the fraction in your calculator and then change the decimal to a percent: (do example 1 with this method)

Example 2 Ms. Lundblad’s groovy math club on campus had 56 members last year. This year there are 137 members. What is the percent increase?

Try with a Partner new: $98 new: 289 people Increase or decrease? Round to nearest whole percent 3. original: $62 4. original: 322 people new: $98 new: 289 people

TOO new: $230 6. Find t, if I = $1400, r = 7%, p = $625 Answers: 5. original: $212 new: $230 6. Find t, if I = $1400, r = 7%, p = $625 Answers: 8% increase 32 years

Homework Pg. 225 #12-20 All

Math Lab Warmups A tree casts a shadow 6 feet long. At the same time, a flagpole 9 feet tall casts a shadow 21 feet long. How tall is the tree? Find I, if p = $650, r = 3%, t = 9 months Find r, if I = $250, p = $5400, t = 4 years

ZONK TIME!! Everything away Whiteboard, sock, marker.. GOOOOOO!