Name_______________________________ Date____________ Period_______
A #10- 6
Interest
I = prt
Find the missing value. Show ALL your work!!
1. principal = $125
rate = 4%
time = 2 years
Formula:______________________
Plug-in:_______________________
Work Out:
2. principal = ?
rate = 5%
time = 4 years
interest = ?
Formula:______________________
Plug-in:_______________________
Work Out:
interest = $90
Interest:____________________
3. principal = $150
Principal:___________________
4. principal = $200
Formula:______________________
Formula:______________________
rate = 6%
Plug-in:_______________________
rate = ?%
Plug-in:_______________________
time = ? years
Work Out:
time = 3 years
Work Out:
interest = $54
interest = $30
Time:____________________
5. What is the rate if you invested $500 for 3
years and earned an interest of $45?
Rate = ____________
Rate:____________________
6. How much money did you borrow from the
bank if you paid $61.75 in interest over a 2 year
period with an interest rate of 3¼ %?
Principal = ____________
7. Mr. Money Box deposits money in an account
that earns 5% simple interest. He earned $546 in
interest 2 years later. How much did he deposit?
8. Simon Smart opened a certificate of deposit
with the money from his bonus check. The bank
offered 4.5% interest for 3 years of deposit. Mr.
Smart calculated that he would earn $87.75
interest in that time. How much did Mr. Smart
deposit to open the account?
Principal = ____________
9. Douglas Debt borrowed $1000 from the bank.
He agreed to repay the bank $1150 after 3 years.
What was the interest rate of the loan?
Principal = ____________
10. What is the interest paid for a loan of $800 at
5% annual interest for 9 months?
Rate = ____________
____________
12. A triangle has vertices with coordinates
(2, 0), (3, –1), and (–2, –5). If the triangle is
dilated by a scale factor of 3, what are the
coordinates of the vertices of the image?
11. A length on a scale drawing is 5.4 cm. The
scale is 1 cm:12 m. Find the actual length.
Interest =
(___ , ___) (___ , ___)
(___ , ___)
A blouse and skirt that normally sell for $39.55 are on sale for 30% off the normal price. How much
is the discount? (Be sure to round your answer to the nearest cent).
total price (100%): $______
13. discount (___%):$_____
14. sale price (____%): $______
If the sales tax rate is 5%, how much is the sales tax for the sale price (#12)?
15. total cost: $______
sale price
$________
16. tax (___%): $______
17. Proportional?
18. What is 18% of 75?
19. Change 0.0040506 to scientific notation.
20. Change 5.124 x 106 to standard notation.
yes no
(circle one)
21. Mrs. Jones is providing
orange juice for the teachers. If
there are 60 teachers, how
many ounces of juice will she
need for each of them to have 8
ounces?
22. How many gallons of juice
will Mrs. Jones buy to have the
number of ounces from #21?
Answer questions below
using these pictures.
23. Triangle abc ≅ Triangle def. Find the missing side length.
x = _________
Use the bar to illustrate the following problem and find the
answer:
1
25. Sydni only has 5 of the pencils she bought at the beginning of
the year. If she has 6 pencils left, how many did she have at the
beginning of the year? How many did she lose?
at the beginning: _______
# lost: _____
27. 40% = _______(fraction)
Shade 40%
28. 75% = _______(fraction)
Shade 75%
26. Give the ratio, decimal, and
percent represented by the
shaded portion of the bar.
ratio
decimal
percent
29. Using a scale factor of
125% would produce:
enlargement or reduction
(circle one)