Interesting Interest!
Money, money, money!
Percent increase, decrease, error
Make sense of it!
Solve the proportion
100
Find the interest earned:
Principal $2350
Interest rate 8%
Time 4 years
Interest earned=$752
I=(2350) x (.08) x (4)
100
Store A sells a Cmfrt hoodie for $55 and offers a 10% discount. Store B sells the same hoodie for $65 and offers a 15% discount. From which store should you buy the hoodie? How much would it cost at each store?
I should buy the hoodie from Store A because...
Store A
$55 x 0.10=$5.50
$55-$5.50=$49.50
Store B
$65 x 0.15=$9.75
$65-$9.75=$55.25
100
Identify the percent of change as an increase or decrease. Then find the percent of change. Round to the nearest tenth of a percent, if necessary.
120 pounds to 180 pounds.
60/120=50% increase
*difference over original
100
Heschel gave free concert tickets to 10% of the students. They gave 640 concert tickets out to students. How many students attend Heschel?
640/x=10/100
There are 6,400 students who attend Heschel.
(not actually, just an example;)
100
4/5=2y/15
y=6
Cross mulitply and solve
10y=60
200
Find the time:
Interest earned $270
Principal $3000
Interest rate 3%
Time=3 years
270=($3000) x (0.03)t
270=90t
200
After a 10% discount, an item sells for $85.50. What was the original price? Round to the nearest hundredth if necessary.
$85.50/?=90/100
8550=90x
$95 is the original price.
200
Identify the percent of change as an increase or decrease. Then find the percent of change. Round to the nearest tenth of a percent, if necessary.
10 feet to 8 feet
2/10
difference over original
20% decrease
200
The percent of sales tax is 6%. What is the total cost, including tax, of a skateboard with an original price of $85.00?
The total price is $90.10
x/85=106/100 or 1.06(85) or find 6% of 85 and add to the orighinal cost.
200
15/c+1=10/18
C=26
300
Find Interest Rate:
Interest earned $50
Principal $500
Time 2 years
Interest rate=5%
50=($500) x (r) x (2)
50=1000(r)
300
The original cost of an item is $250. What does the item sell for after a 40% markup, followed by 30% discount?
Markup=x/250=140/100 or 1.4(250)=350
Discount=x/350=70/100 o (0.7)(350)=
The item sells for $245.00
300
Identify the percent of change as an increase or decrease. Then find the percent of change. Round to the nearest tenth of a percent, if necessary.
400km to 350km
50/400
12.5% decrease
300
Two candidates ran for President of Heschel's Student Council. They were the only two who received votes. Benji received 45% of the votes. Vrej received 171,919 votes. What was the total amount of votes for the election?
171919/x=55/100
x=312,580 votes
300
Free points!!
Nice work so far!
400
Find the Principal
Interest earned $65
Interest rate 5%
Time 2 years
Principal=$650
65=P x (0.05) x (2)
65=(0.10)p
P=$650
400
A $45.00 item is marked up 35%. Find the selling price.
x/45=135/100 or 1.35(45) or find the discount and then subtract it from the original price.
$60.75 is the selling price
400
Identify the percent of change as an increase or decrease. Then find the percent of change. Round to the nearest tenth of a percent, if necessary.
12 liters to 36 liters
24/12
200% increase
400
400
2n+2/7=18/21
n=2
500
Find the Interest earned:
Principal $25,000
Interest rate 7%
Time 5 years
Interest earned=$8,750
I=(25000)(0.07)(5)
500
A $130 item is on sale for a 60% discount. Find the sale price.
x/130=40/100 or 0.4(130) OR find 60% of 130 and subtract from 130.
The sale price is $52.00
500
You estimate that 430 students will vote in the school election. The actual number of students who voted was 400. Find the percent of error.
30/400 (difference over actual)
7.5% error
500
Sunday afternoon between 3:00 and 4:00, you spend 1/4 of the hour preparing for your math test with Stacie, 40% of the hour cleaning your room, and 35% of the hour online shopping. Write the tasks in order from least to greatest amount of time. Explain
math 25%
shopping 35%
cleaning 40%
Convert 1/4 hour to percentage in order to compare and then order them least to greatest.
500
Not a proportion, but change from a percent to a decimal:
73%
121.6%
0.5%
32.3%
0.73
1.216
0.005
.323