DO you know how to do this MATH? 10 points?

Question

(SHOW WORK,EXPLAIN HOW YOU FOUND ANSERS)
USE THE PERCENT PROPORTION TO SOLVE EACH PROBLEM.
ESTIMATE:
23. 25% OF 80 24. 63% OF 77
25.FIND THE INTEREST ON $2,700 THAT IS INVESTED AT 4% FOR 2 1/2 YEARS.

26. FIND THE DISCOUNT FOR A $135 COAT THAT IS ON SALE AT 15% OFF

Answer 1

25% OF 80 = (25/100) * 80
=(1/4)*80
=20

63% OF 77 = (63/100)*77
=48.51

FIND THE INTEREST ON $2,700 THAT IS INVESTED AT 4% FOR 2 1/2 YEARS

2 1/2 YEARS= 30months
Use the formula I = Prt
= 2700 * (4/100) * 30
=$3240

FIND THE DISCOUNT FOR A $135 COAT THAT IS ON SALE AT 15% OFF
Discount = (15/100) * 135
= $20.25
:.Discount price is $ (135 - 20.25) = $114.75

Answer 2

23. 25% of 80
1/4 = 80/1 =20

24. 63% of 77
63/100=x/77
100x=6851
x=68.51

25. $2700 @ 4% for 2 1/2 years
$ 2700 /1 x 4/100 x 30(30 months=2 1/2 yrs)
2700 x 4/100 x 30=
324000/100=3240

26. $ 135 at 15% off

x/135=15/100
100x=2025
x=20.25

$135-$20.25=$114.75

Answer 3

QUESTION #1

a) 25% is equivalent to 25/100.

b) 25/100 = 0.25

c) Therefore you must multiply the percentile by the amount given. (0.25 * 80.24) = 20.06 (20 estimated)

Question #2: Same as above ^ use same procedures.

Answer 4

MATH, ACTIVITIES and FUN.

http://www.gcse.com/maths/mindex.htm?

http://www.sosmath.com/wwwsites.html

http://www.webmath.com/index.html

http://mathforum.org/dr.math/

http://www.tc.cornell.edu/Services/Education/Gateways/Math_and_Science/mathematics.htm