Percent of a Number
Percent Proportion
Percents of Numbers
Percent of Change
Simple Interest/ Sales Tax and Discount
100
8% of 50
4
100
3 is what percent of 10?
30%
100
20% of 50
10
100
Original:4 New:5
25% increase
100

Find the Interest:

$300 at 5% for 2 years
$30
200
110% of 70?
77
200
What number is 15% of 40
6
200
50% of 34?
17
200
Original: 30 New: 18
40% decrease
200
$58 ski lift ticket; 20% discount
$46.40
300
5 1/2% of 60?
3.3
300
81 is 54% of what number
150
300
10% of 23
2.3
300
Original: 50 inches New: 60 inches
20% increase
300

Find the total:

$425 at 6% for 2 years 

$476
400
4/5% of 500
 4
400
161 is 92% of what number
175
400
21% of 90
18.9
400
Original: $750 New: $690
8% increase
400
Find the total:

$99 CD player; 5% tax

$103.95
500
20 1/4% of 3
0.61
500
What number is 31.5% of 200
63
500
22.2% of 114
25.3
500
Backpack: $14, 40% markup
$19.60
500
The value of a rare coin increased in sale from $350 to $420 in only 6 months. Find the simple interest rate for the value of the coin.
40%
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