Check Point Answers 301
19. 0.049 = 4.9%
20. 5.002 = 500.2%
21.
The interest is $3,600.
22.
The interest rate is 6.5%.
23.
You will pay $8.23 tax.
24.
The tip should be approximately $7.17.
- A total of 8 people at $22 per person is a bill
of $176. The tip will be 0.18 176 31.68
or $31.68. Adding the tip to the bill brings
the total to $207.68. Dividing that total
eight ways means that each person’s share is
$25.96.
- The increase is $650 – $500 = $150.
The investment increased 30%.
- The decrease is 7.5 – 6.75 = 0.75 minutes.
Her time decreased 10%.
I prt
I 18000 0.04 $3,600
5
Iprt
r
r
130 1000 2
130
2000
65.%
tax 0.047 175 8.225
tip 0.20 $35.84 7.168
150
500 100
500 15000
30
x
x
x
0.75
7.5 100
7.5 75
10
x
x
x
10.
- 45 is 20% of 225.
- 16 is 25% of 64.
- 15% of 80 is 12.
- 63 is 300% of 21.
- 120% of 55 is 66.
16.
17. 85.3% = 0.853
18.
3
510
530
6
x
x
x
45 20
100
20 4500
225
x
x
x
16
64 100
64 1600
25
x
x
x
x
x
x
80
15
100
100 1200
12
63
21 100
21 6300
300
x
x
x
x
x
x
55
120
100
100 6600
66
42%^42
100
21
50
5
2
2.5 250%
