Need some help on basic discount/percentage problems?

Question

1. find 40m as a percentage of 50m?


2. a new car falls in value by 25% in a year. after a year it is worth $9600. find the price of the car when it was new?

3. a cd player priced at $70 is in a sale with a discount of 20%. what is the discount price??

Answer 1

1.

40/50 X 100
= 4000/50
= 80%

2.

If it falls by 25%, then the new price of $9600 is
100% - 25% = 75% of the old price

If 75% = 9600
100% = (100 X 9600)/75
= 960000/75
= $12,800

3.

Find 20% 0f $70
= 20%/100% X 70
= 1/5 X 70
= $14

The discounted price is therefore
$70 - $14 = $56

Answer 2

1. (40 divide by 50) times 100 = 80 %

2. The car value is fallen 25% so it's at 75% (100-25)

so 9600 divide 75 times 100 = $ 12800

3. Discounted price is (100 - 20) = 80% of full

70 times 80 divide 100 = $56

Answer 3

1. (40/50)*100% = 80%
2. 9600*100/(100-25) = $12,800
3. 70*(100-20)/100 = $56

Answer 4

2. Let's call the original price x.
x - .25x = 9600
.75x = 9600
x = $12,800

3. If the discount is 20%, you'll pay 80% of the original price.
.8(70) = $56

Or 70 - .2(70) = 70 - 14 = $56

Answer 5

1-
50 = 100%
40 = ?%
= (40 *100)/50
= 4000/50 = 400/5 = 80%
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2-
9600 = (100-25)%
? = 100%
= (9600 x 100) /75
= 960000/75
=12,800
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3-
70$ = 100%
? = 20%
(70 x 20) / 100
1400/100
=$14 is the discount price