英文文字題*Percentages

1. the total of the meal will be $79.2x1.10=$87.12.
2.a)the volume of the normal size is 600ml/0.40x0.6=900ml
b)900mlx1.05=945ml

1. the price of the meal she has ordered
$79.2 / (1+10%)
=$72

2. a) the volume of normal size is
600/40%
=1500mL
b) its new volume
1500x(1+5%)
=945mL

Sure win!>.

1) $79.2 / 1.1 = $72

2a) 600ml / 0.4 = 1500ml
b) 1500 (1+5%) = 1500 (1.05) = 1575ml

2007-11-11 14:43:53 補充：
2a) normal size: 1500ml - 600ml = 900ml b) new vol. of normal size: 900 (1+5%) = 900 (1.05) = 945ml

1.A 10% servicecharge is added to thebill in a certain restaurant. Stella has to pay $79.2. What is the price of the meal shehas ordered?


ANS :

The price
=79.2 / (1+10%)
=79.2 / 110%
=$72

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2. There are two containes of peanut oil, the normal size and the jumbo size. The volume of the normal size is less than that of the jumbo size by 40% and the difference in volume is 600 mL.
a) Find the volume of the normal size.
b) If the volume of the normal size is increased by 5%, find its new volume.


ANS :

(a)
Let volume of the jumbo size be A mL
A x 40% = 600
A = 1500

The volume of the normal size
= 1500-600
= 900 mL

(b)
The new volume of the normal size
= 900 x (1+5%)
= 900 x 105%
= 945 mL


希望幫到你la~~

1.A 10% servicecharge is added to thebill in a certain restaurant.
Stella has to pay $79.2. What is the price of the meal shehas ordered?
y(100%+10%)=79.2
y=79.2/110%
y=72
The price of the meal shehas ordered is $72

2. There are two containes of peanut oil, the normal size and the jumbo size. The volume of the normal size is less than that of the jumbo size by 40% and the difference in volume is 600 mL.
a) Find the volume of the normal size.
y40%=600
y=1500
The volume of the normal size is 1500mL

b) If the volume of the normal size is increased by 5%, find its new volume.
1500(100%+5%)
=1575mL
The new volume is 1575mL

2007-11-11 14:35:06 補充：
Oops the 1500 in Question 2 is the jumbo size :pNormal size should be the jumbo - normal = 6001500-y=600y=900The volume of the normal size is 900mLb)900x105%=945The new volume is 945mL

1. the price of the meal
= $79.2×(1+10%)
= $87.12
∴ she has ordered $87.12

2(a)Let x mL be the volume of the jumbo size container
x(40%) = 600
x(0.4) = 600
x = 1500
∴the jumbo size container is 1500 mL.

The size of the normal size container
= 1500(1﹣40%)
= 1500(60%)
= 1500(0.6)
= 900mL

(b.)The new volume
= 900*(100%+5%)
= 900(105%)
= 900(1.05)
= 945mL


2007-11-11 14:36:59 補充：
(1)The price=79.2÷(1 10%)=79.2÷1.1=$72∴she has ordered $72